diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Http3.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Http3.cs
index dfbf9ee89beea0..aeae11532594f3 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Http3.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTest.Http3.cs
@@ -21,7 +21,7 @@
 
 namespace System.Net.Http.Functional.Tests
 {
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class HttpClientHandlerTest_Http3 : HttpClientHandlerTestBase
     {
         protected override Version UseVersion => HttpVersion.Version30;
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.cs
index 220e6706fcf168..662fd3479ce1a3 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientHandlerTestBase.SocketsHttpHandler.cs
@@ -30,13 +30,14 @@ protected static async Task<Stream> DefaultConnectCallback(EndPoint endPoint, Ca
 
         protected static bool IsWinHttpHandler => false;
 
-        public static bool IsQuicSupported
+        public static bool IsHttp3Supported
         {
             get
             {
                 try
                 {
-                    return QuicConnection.IsSupported;
+                    return QuicConnection.IsSupported
+                        && (bool)Type.GetType("System.Net.Http.GlobalHttpSettings+SocketsHttpHandler, System.Net.Http").GetProperty("AllowHttp3").GetValue(null);
                 }
                 catch (System.PlatformNotSupportedException)
                 {
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.cs
index a0844444705d71..b739faf0dd72d8 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/HttpClientMiniStressTest.cs
@@ -31,7 +31,7 @@ public void CreateAndDestroyManyClients(int numClients)
         }
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_HttpClientMiniStress_Http3 : HttpClientMiniStress
     {
         public SocketsHttpHandler_HttpClientMiniStress_Http3(ITestOutputHelper output) : base(output) { }
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.cs
index c1cbd3540a823d..53159e0a824917 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/MetricsTest.cs
@@ -1346,7 +1346,7 @@ public HttpMetricsTest_Http20_HttpMessageInvoker(ITestOutputHelper output) : bas
         }
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public class HttpMetricsTest_Http30 : HttpMetricsTest
     {
         protected override Version UseVersion => HttpVersion.Version30;
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.cs
index 8fe520464e5784..1f6ad745e82e04 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/ResponseStreamZeroByteReadTests.cs
@@ -181,7 +181,7 @@ public Http2ResponseStreamZeroByteReadTest(ITestOutputHelper output) : base(outp
         protected override Version UseVersion => HttpVersion.Version20;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class Http3ResponseStreamZeroByteReadTest : ResponseStreamZeroByteReadTestBase
     {
         public Http3ResponseStreamZeroByteReadTest(ITestOutputHelper output) : base(output) { }
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs
index 2577094cb52b4e..7a50f81323c9b4 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/SocketsHttpHandlerTest.cs
@@ -124,7 +124,7 @@ public SocketsHttpHandler_HttpClientHandler_Asynchrony_Test_Http2(ITestOutputHel
         protected override Version UseVersion => HttpVersion.Version20;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_HttpClientHandler_Asynchrony_Test_Http3 : SocketsHttpHandler_HttpClientHandler_Asynchrony_Test
     {
         public SocketsHttpHandler_HttpClientHandler_Asynchrony_Test_Http3(ITestOutputHelper output) : base(output) { }
@@ -331,7 +331,7 @@ public SocketsHttpHandler_DiagnosticsTest_Http2(ITestOutputHelper output) : base
         protected override Version UseVersion => HttpVersion.Version20;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_DiagnosticsTest_Http3 : DiagnosticsTest
     {
         public SocketsHttpHandler_DiagnosticsTest_Http3(ITestOutputHelper output) : base(output) { }
@@ -1248,7 +1248,7 @@ public async Task Http2GetAsync_TrailerHeaders_TrailingPseudoHeadersThrow()
         }
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_Http3_TrailingHeaders_Test : SocketsHttpHandler_TrailingHeaders_Test
     {
         public SocketsHttpHandler_Http3_TrailingHeaders_Test(ITestOutputHelper output) : base(output) { }
@@ -1815,7 +1815,7 @@ public SocketsHttpHandler_HttpClientHandler_MaxResponseHeadersLength_Http2(ITest
         protected override Version UseVersion => HttpVersion.Version20;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_HttpClientHandler_MaxResponseHeadersLength_Http3 : SocketsHttpHandler_HttpClientHandler_MaxResponseHeadersLength
     {
         public SocketsHttpHandler_HttpClientHandler_MaxResponseHeadersLength_Http3(ITestOutputHelper output) : base(output) { }
@@ -4197,42 +4197,42 @@ public SocketsHttpHandler_HttpClientHandler_Cancellation_Test_Http2(ITestOutputH
         protected override Version UseVersion => HttpVersion.Version20;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandlerTest_HttpClientHandlerTest_Http3 : HttpClientHandlerTest
     {
         public SocketsHttpHandlerTest_HttpClientHandlerTest_Http3(ITestOutputHelper output) : base(output) { }
         protected override Version UseVersion => HttpVersion.Version30;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandlerTest_Cookies_Http3 : HttpClientHandlerTest_Cookies
     {
         public SocketsHttpHandlerTest_Cookies_Http3(ITestOutputHelper output) : base(output) { }
         protected override Version UseVersion => HttpVersion.Version30;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandlerTest_HttpClientHandlerTest_Headers_Http3 : HttpClientHandlerTest_Headers
     {
         public SocketsHttpHandlerTest_HttpClientHandlerTest_Headers_Http3(ITestOutputHelper output) : base(output) { }
         protected override Version UseVersion => HttpVersion.Version30;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_HttpClientHandler_Cancellation_Test_Http3 : SocketsHttpHandler_Cancellation_Test
     {
         public SocketsHttpHandler_HttpClientHandler_Cancellation_Test_Http3(ITestOutputHelper output) : base(output) { }
         protected override Version UseVersion => HttpVersion.Version30;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_HttpClientHandler_AltSvc_Test_Http3 : HttpClientHandler_AltSvc_Test
     {
         public SocketsHttpHandler_HttpClientHandler_AltSvc_Test_Http3(ITestOutputHelper output) : base(output) { }
         protected override Version UseVersion => HttpVersion.Version30;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_HttpClientHandler_Finalization_Http3 : HttpClientHandler_Finalization_Test
     {
         public SocketsHttpHandler_HttpClientHandler_Finalization_Http3(ITestOutputHelper output) : base(output) { }
@@ -4389,7 +4389,7 @@ public SocketsHttpHandler_RequestContentLengthMismatchTest_Http2(ITestOutputHelp
         protected override Version UseVersion => HttpVersion.Version20;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_RequestContentLengthMismatchTest_Http3 : SocketsHttpHandler_RequestContentLengthMismatchTest
     {
         public SocketsHttpHandler_RequestContentLengthMismatchTest_Http3(ITestOutputHelper output) : base(output) { }
@@ -4573,7 +4573,7 @@ public SocketsHttpHandler_SocketsHttpHandler_SecurityTest_Http2(ITestOutputHelpe
         protected override Version UseVersion => HttpVersion.Version20;
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_SocketsHttpHandler_SecurityTest_Http3 : SocketsHttpHandler_SecurityTest, IClassFixture<CertificateSetup>
     {
         public SocketsHttpHandler_SocketsHttpHandler_SecurityTest_Http3(ITestOutputHelper output, CertificateSetup certificateSetup) : base(output, certificateSetup) { }
@@ -4701,7 +4701,7 @@ await Http11LoopbackServerFactory.Singleton.CreateClientAndServerAsync(async uri
         }
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class SocketsHttpHandler_HttpRequestErrorTest_Http30 : SocketsHttpHandler_HttpRequestErrorTest
     {
         public SocketsHttpHandler_HttpRequestErrorTest_Http30(ITestOutputHelper output) : base(output) { }
diff --git a/src/libraries/System.Net.Http/tests/FunctionalTests/TelemetryTest.cs b/src/libraries/System.Net.Http/tests/FunctionalTests/TelemetryTest.cs
index 27c29456346db2..85587cac87156e 100644
--- a/src/libraries/System.Net.Http/tests/FunctionalTests/TelemetryTest.cs
+++ b/src/libraries/System.Net.Http/tests/FunctionalTests/TelemetryTest.cs
@@ -1175,7 +1175,7 @@ public sealed class TelemetryTest_Http20 : TelemetryTest
         public TelemetryTest_Http20(ITestOutputHelper output) : base(output) { }
     }
 
-    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsQuicSupported))]
+    [ConditionalClass(typeof(HttpClientHandlerTestBase), nameof(IsHttp3Supported))]
     public sealed class TelemetryTest_Http30 : TelemetryTest
     {
         protected override Version UseVersion => HttpVersion.Version30;
diff --git a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
index eceaebf36f48a0..34f1eb1d03eeab 100644
--- a/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
+++ b/src/tools/illink/src/ILLink.Tasks/build/Microsoft.NET.ILLink.targets
@@ -49,6 +49,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     <_EnableConsumingManagedCodeFromNativeHosting Condition="'$(_EnableConsumingManagedCodeFromNativeHosting)' == ''">false</_EnableConsumingManagedCodeFromNativeHosting>
     <VerifyDependencyInjectionOpenGenericServiceTrimmability Condition="'$(VerifyDependencyInjectionOpenGenericServiceTrimmability)' == ''">true</VerifyDependencyInjectionOpenGenericServiceTrimmability>
     <JsonSerializerIsReflectionEnabledByDefault Condition="'$(JsonSerializerIsReflectionEnabledByDefault)' == ''">false</JsonSerializerIsReflectionEnabledByDefault>
+    <Http3Support Condition="'$(Http3Support)' == ''">false</Http3Support>
     <!-- Linux Bionic doesn't ship GSSAPI, so enable managed implementation -->
     <_UseManagedNtlm Condition="'$(_UseManagedNtlm)' == '' and $(RuntimeIdentifier.StartsWith('linux-bionic'))">true</_UseManagedNtlm>
     <!-- Trim managed NTLM on Linux when it's not explicitly requested -->