diff --git a/infra/gcp/lib_iam.sh b/infra/gcp/lib_iam.sh
index b53173c37ec..c8f937c5603 100755
--- a/infra/gcp/lib_iam.sh
+++ b/infra/gcp/lib_iam.sh
@@ -24,47 +24,6 @@
 readonly tmp_dir=$(mktemp -d "/tmp/k8sinfra-lib_iam.XXXXX")
 trap 'rm -rf "${tmp_dir}"' EXIT
 
-# Ensure that custom IAM role exists, creating one if needed
-# Arguments:
-#   $1:  The GCP project
-#   $2:  The role name (e.g. "ServiceAccountLister")
-#   $3:  The role title (e.g. "Service Account Lister")
-#   $4:  The role description (e.g. "Can list ServiceAccounts.")
-#   $5+: The role permissions (e.g. "iam.serviceAccounts.list")
-# Example usage:
-#   ensure_custom_iam_role \
-#       kubernetes-public \
-#       ServiceAccountLister \
-#       "Service Account Lister" \
-#       "Can list ServiceAccounts." \
-#       iam.serviceAccounts.list
-function ensure_custom_iam_role() {
-    if [ $# -lt 5 ] || [ -z "${1}" ] || [ -z "${2}" ] || [ -z "${3}" ] \
-        || [ -z "${4}" ] || [ -z "${5}" ]
-    then
-        echo -n "ensure_custom_iam_role(gcp_project, name, title," >&2
-        echo    " description, permission...) requires at least 5 arguments" >&2
-        return 1
-    fi
-
-    local gcp_project="${1}"; shift
-    local name="${1}"; shift
-    local title="${1}"; shift
-    local description="${1}"; shift
-    local permissions; permissions=$(join_by , "$@")
-
-    if ! gcloud --project "${gcp_project}" iam roles describe "${name}" \
-        >/dev/null 2>&1
-    then
-        gcloud --project "${gcp_project}" --quiet \
-            iam roles create "${name}" \
-            --title "${title}" \
-            --description "${description}" \
-            --stage GA \
-            --permissions "${permissions}"
-    fi
-}
-
 # Ensure that custom IAM role exists in organization and in sync with definition in file
 # Arguments:
 #   $1:  The role name (e.g. "foo.barrer")