diff --git a/src/libraries/System.Text.Json/tests/Common/CollectionTests/CollectionTests.Dictionary.NonStringKey.cs b/src/libraries/System.Text.Json/tests/Common/CollectionTests/CollectionTests.Dictionary.NonStringKey.cs
index 177b42fae56e6..04b3b1446b57c 100644
--- a/src/libraries/System.Text.Json/tests/Common/CollectionTests/CollectionTests.Dictionary.NonStringKey.cs
+++ b/src/libraries/System.Text.Json/tests/Common/CollectionTests/CollectionTests.Dictionary.NonStringKey.cs
@@ -578,6 +578,7 @@ public class SuffixNamingPolicy : JsonNamingPolicy
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void RoundtripAllDictionaryConverters()
         {
             const string Expected = @"{""1"":1}";
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/JsonNode/JsonArrayTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/JsonNode/JsonArrayTests.cs
index e5b1c18cf57d4..3464791348acf 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/JsonNode/JsonArrayTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/JsonNode/JsonArrayTests.cs
@@ -199,7 +199,7 @@ public static void CopyTo()
         [Fact]
         public static void ConvertJSONArrayToIListOfJsonNode()
         {
-            dynamic obj = JsonSerializer.Deserialize<JsonArray>("[42]");
+            JsonArray obj = JsonSerializer.Deserialize<JsonArray>("[42]");
             Assert.Equal(42, (int)obj[0]);
 
             IList<JsonNode> ilist = obj;
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/NewtonsoftTests/JsonSerializerTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/NewtonsoftTests/JsonSerializerTests.cs
index 37ff78fa6e3be..d62b1342303a6 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/NewtonsoftTests/JsonSerializerTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/NewtonsoftTests/JsonSerializerTests.cs
@@ -65,6 +65,7 @@ public void DeserializeBoolean_EmptyString()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public void IncompleteContainers()
         {
             JsonException e = Assert.Throws<JsonException>(() => JsonSerializer.Deserialize<IList<object>>("[1,"));
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs
index e233a3440a4b3..38bac92fe1482 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CacheTests.cs
@@ -168,6 +168,7 @@ public static void PropertyCacheWithMinInputsLast()
 
         [Theory]
         [MemberData(nameof(WriteSuccessCases))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static async Task MultipleTypes(ITestClass testObj)
         {
             Type type = testObj.GetType();
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CollectionTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CollectionTests.cs
index d0a10baf3624e..51e4c0d5e4a78 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CollectionTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CollectionTests.cs
@@ -1,8 +1,11 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using Xunit;
+
 namespace System.Text.Json.Serialization.Tests
 {
+    [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
     public sealed partial class CollectionTestsDynamic : CollectionTests
     {
         public CollectionTestsDynamic() : base(JsonSerializerWrapperForString.StringSerializer, JsonSerializerWrapperForStream.AsyncStreamSerializer) { }
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.Dynamic.Sample.Tests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.Dynamic.Sample.Tests.cs
index 5b208c603ff1e..1c6bca5093649 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.Dynamic.Sample.Tests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/CustomConverterTests/CustomConverterTests.Dynamic.Sample.Tests.cs
@@ -22,7 +22,7 @@ private enum MyCustomEnum
             Hello = 77
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void VerifyPrimitives()
         {
             var options = new JsonSerializerOptions();
@@ -67,7 +67,7 @@ public static void VerifyPrimitives()
             Assert.Equal(4.2, dbl);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void VerifyArray()
         {
             var options = new JsonSerializerOptions();
@@ -97,7 +97,7 @@ public static void VerifyArray()
             Assert.Equal(10, (int)obj.MyArray[0]);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void JsonDynamicTypes_Serialize()
         {
             var options = new JsonSerializerOptions();
@@ -149,7 +149,7 @@ public static void JsonDynamicTypes_Serialize()
             JsonTestHelper.AssertJsonEqual("{\"One\":1,\"Two\":2}", json);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void JsonDynamicTypes_Deserialize()
         {
             var options = new JsonSerializerOptions();
@@ -164,7 +164,7 @@ public static void JsonDynamicTypes_Deserialize()
             JsonSerializer.Deserialize<JsonDynamicString>("\"str\"", options);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void JsonDynamicTypes_Deserialize_AsObject()
         {
             var options = new JsonSerializerOptions();
@@ -181,7 +181,7 @@ public static void JsonDynamicTypes_Deserialize_AsObject()
         /// <summary>
         /// Use a mutable DOM with the 'dynamic' keyword.
         /// </summary>
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void VerifyMutableDom_UsingDynamicKeyword()
         {
             var options = new JsonSerializerOptions();
@@ -221,7 +221,7 @@ public static void VerifyMutableDom_UsingDynamicKeyword()
         /// <summary>
         /// Use a mutable DOM without the 'dynamic' keyword.
         /// </summary>
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void VerifyMutableDom_WithoutUsingDynamicKeyword()
         {
             var options = new JsonSerializerOptions();
@@ -263,7 +263,7 @@ public static void VerifyMutableDom_WithoutUsingDynamicKeyword()
         /// Use a mutable DOM without the 'dynamic' keyword and use round-trippable values
         /// meaning the 'JsonDynamicType' values are used instead of raw primitives.
         /// </summary>
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void VerifyMutableDom_WithoutUsingDynamicKeyword_JsonDynamicType()
         {
             var options = new JsonSerializerOptions();
@@ -306,7 +306,7 @@ void Verify()
             }
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void DynamicObject_MissingProperty()
         {
             var options = new JsonSerializerOptions();
@@ -317,7 +317,7 @@ public static void DynamicObject_MissingProperty()
             Assert.Equal(null, obj.NonExistingProperty);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void DynamicObject_CaseSensitivity()
         {
             var options = new JsonSerializerOptions();
@@ -338,7 +338,7 @@ public static void DynamicObject_CaseSensitivity()
             Assert.Equal(42, (int)obj.MYPROPERTY);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void NamingPoliciesAreNotUsed()
         {
             const string Json = "{\"myProperty\":42}";
@@ -353,7 +353,7 @@ public static void NamingPoliciesAreNotUsed()
             JsonTestHelper.AssertJsonEqual(Json, json);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void NullHandling()
         {
             var options = new JsonSerializerOptions();
@@ -363,7 +363,7 @@ public static void NullHandling()
             Assert.Null(obj);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void QuotedNumbers_Deserialize()
         {
             var options = new JsonSerializerOptions();
@@ -381,7 +381,7 @@ public static void QuotedNumbers_Deserialize()
             Assert.Equal(float.NaN, (float)obj);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void QuotedNumbers_Serialize()
         {
             var options = new JsonSerializerOptions();
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/DynamicTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/DynamicTests.cs
index 8ac2ea1656bc3..7c3b9315ecd12 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/DynamicTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/DynamicTests.cs
@@ -37,7 +37,7 @@ internal static ExpandoObject GetExpandoObject()
             return myDynamic;
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void DynamicKeyword()
         {
             dynamic myDynamic = GetExpandoObject();
@@ -100,7 +100,7 @@ void VerifyArray()
             }
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsReflectionEmitSupported))]
         public static void ExpandoObject()
         {
             ExpandoObject expando = JsonSerializer.Deserialize<ExpandoObject>(Json);
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs
index 42ec4baa1e7bf..6f09ae4d9911d 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NullableTests.cs
@@ -11,6 +11,7 @@ namespace System.Text.Json.Serialization.Tests
     public static partial class NullableTests
     {
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void DictionaryWithNullableValue()
         {
             Dictionary<string, float?> dictWithFloatValue = new Dictionary<string, float?> { { "key", 42.0f } };
@@ -170,6 +171,7 @@ public class SimpleClassWithDictionariesWithNullableValues
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void ClassWithDictionariesWithNullableValues()
         {
             string json =
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NumberHandlingTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NumberHandlingTests.cs
index c2ec42535b3f6..7b0e89439d00a 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NumberHandlingTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/NumberHandlingTests.cs
@@ -360,6 +360,7 @@ public class Class_With_ListsOfBoxedNonNumbers
 
         [Fact]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/49936", TestPlatforms.Android)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void Number_AsCollectionElement_RoundTrip()
         {
             RunAsCollectionElementTest(JsonNumberTestData.Bytes);
@@ -603,6 +604,7 @@ private static void AssertDictionaryElements_StringValues(string serialized)
         [Fact]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/39674", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoInterpreter))]
         [SkipOnCoreClr("https://github.com/dotnet/runtime/issues/45464", RuntimeConfiguration.Checked)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void DictionariesRoundTrip()
         {
             RunAllDictionariessRoundTripTest(JsonNumberTestData.ULongs);
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.ReadTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.ReadTests.cs
index 6a36e96d3818b..dad7330b97a72 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.ReadTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.ReadTests.cs
@@ -368,6 +368,7 @@ private ConcreteDerivedClassWithNoPublicDefaultCtor(string error)
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void ReadClassWithStringToPrimitiveDictionary()
         {
             TestClassWithStringToPrimitiveDictionary obj = JsonSerializer.Deserialize<TestClassWithStringToPrimitiveDictionary>(TestClassWithStringToPrimitiveDictionary.s_data);
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.WriteTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.WriteTests.cs
index d4e551d6d01b2..6842ab78ae483 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.WriteTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Object.WriteTests.cs
@@ -17,6 +17,7 @@ public static void VerifyTypeFail()
 
         [Theory]
         [MemberData(nameof(WriteSuccessCases))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void Write(ITestClass testObj)
         {
             var options = new JsonSerializerOptions { IncludeFields = true };
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReadValueTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReadValueTests.cs
index c29c401039161..b256f944f36aa 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReadValueTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReadValueTests.cs
@@ -508,6 +508,7 @@ public static void ReadSimpleStruct()
         }
 
         [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void ReadClasses()
         {
             {
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReferenceHandlerTests.Deserialize.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReferenceHandlerTests.Deserialize.cs
index 18221ff762f4d..568956a952478 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReferenceHandlerTests.Deserialize.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/ReferenceHandlerTests.Deserialize.cs
@@ -1240,6 +1240,7 @@ public static void ReferenceObjectBeforePreservedObject()
 
         [Theory]
         [MemberData(nameof(ReadSuccessCases))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void ReadTestClassesWithExtensionOption(Type classType, byte[] data)
         {
             var options = new JsonSerializerOptions { IncludeFields = true, ReferenceHandler = ReferenceHandler.Preserve };
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/SpanTests.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/SpanTests.cs
index c01ce57372c1f..acd80b190c993 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/SpanTests.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/SpanTests.cs
@@ -17,6 +17,7 @@ public static void ParseNullTypeFail()
 
         [Theory]
         [MemberData(nameof(ReadSuccessCases))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void Read(Type classType, byte[] data)
         {
             var options = new JsonSerializerOptions { IncludeFields = true };
@@ -27,6 +28,7 @@ public static void Read(Type classType, byte[] data)
 
         [Theory]
         [MemberData(nameof(ReadSuccessCases))]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public static void ReadFromStream(Type classType, byte[] data)
         {
             MemoryStream stream = new MemoryStream(data);
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Stream.Collections.cs b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Stream.Collections.cs
index b5fa2534860bd..f8875dc7d116e 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Stream.Collections.cs
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/Stream.Collections.cs
@@ -18,6 +18,7 @@ public partial class StreamTests
         [Fact]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/35927", typeof(PlatformDetection), nameof(PlatformDetection.IsMonoInterpreter))]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/35927", TestPlatforms.Browser)]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/58204", TestPlatforms.iOS | TestPlatforms.tvOS)]
         public async Task HandleCollectionsAsync()
         {
             await RunTestAsync<string>();