diff --git a/src/WebJobs.Script/Diagnostics/DiagnosticEventConstants.cs b/src/WebJobs.Script/Diagnostics/DiagnosticEventConstants.cs
index 2669a22a6b..ff58e47915 100644
--- a/src/WebJobs.Script/Diagnostics/DiagnosticEventConstants.cs
+++ b/src/WebJobs.Script/Diagnostics/DiagnosticEventConstants.cs
@@ -34,5 +34,8 @@ internal static class DiagnosticEventConstants
 
         public const string WorkerRuntimeDoesNotMatchWithFunctionMetadataErrorCode = "AZFD0013";
         public const string WorkerRuntimeDoesNotMatchWithFunctionMetadataHelpLink = "https://aka.ms/functions-invalid-worker-runtime";
+
+        public const string DeprecatedProxiesErrorCode = "AZFD0014";
+        public const string DeprecatedProxiesHelpLink = "https://azure.microsoft.com/en-us/updates?id=community-support-for-azure-functions-proxies-will-end-on-30-september-2025";
     }
 }
diff --git a/src/WebJobs.Script/Host/ProxyFunctionProvider.cs b/src/WebJobs.Script/Host/ProxyFunctionProvider.cs
index 01cdc36720..59da1d4fbc 100644
--- a/src/WebJobs.Script/Host/ProxyFunctionProvider.cs
+++ b/src/WebJobs.Script/Host/ProxyFunctionProvider.cs
@@ -14,6 +14,7 @@
 using Microsoft.Azure.AppService.Proxy.Client;
 using Microsoft.Azure.WebJobs.Logging;
 using Microsoft.Azure.WebJobs.Script.Description;
+using Microsoft.Azure.WebJobs.Script.Diagnostics;
 using Microsoft.Azure.WebJobs.Script.Eventing;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
@@ -41,6 +42,8 @@ public ProxyFunctionProvider(IOptions<ScriptJobHostOptions> scriptOptions, IEnvi
             _logger = loggerFactory.CreateLogger(LogCategories.Startup);
             if (_environment.IsProxiesEnabled())
             {
+                _logger.LogDiagnosticEventWarning(DiagnosticEventConstants.DeprecatedProxiesErrorCode, "Azure Functions Proxies are deprecated and community support will end on September 30, 2025. Please migrate to Azure API Management or Azure Container Apps. See https://azure.microsoft.com/en-us/updates?id=community-support-for-azure-functions-proxies-will-end-on-30-september-2025 for more information.", DiagnosticEventConstants.DeprecatedProxiesHelpLink, null);
+
                 if (_environment.IsFlexConsumptionSku())
                 {
                     _logger.LogWarning("Proxies are not supported in Flex Consumption. Proxy definitions will be ignored.");
diff --git a/test/WebJobs.Script.Tests/ProxyFunctionProviderTests.cs b/test/WebJobs.Script.Tests/ProxyFunctionProviderTests.cs
index 9f5b799546..5b0de64a7b 100644
--- a/test/WebJobs.Script.Tests/ProxyFunctionProviderTests.cs
+++ b/test/WebJobs.Script.Tests/ProxyFunctionProviderTests.cs
@@ -10,6 +10,7 @@
 using System.Threading.Tasks;
 using Microsoft.Azure.WebJobs.Script.Description;
 using Microsoft.Azure.WebJobs.Script.Eventing;
+using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Logging.Abstractions;
 using Microsoft.Extensions.Options;
 using WebJobs.Script.Tests;
@@ -60,5 +61,35 @@ public async Task ProxyMetadata_WhenProxyFileChanges_IsRefreshed()
                 Assert.Equal(20, proxyMetadata3.Length);
             }
         }
+
+        [Fact]
+        public void ProxyFunctionProvider_WhenProxiesEnabled_EmitsDiagnosticWarning()
+        {
+            var options = new OptionsWrapper<ScriptJobHostOptions>(new ScriptJobHostOptions
+            {
+                RootScriptPath = Path.GetTempPath()
+            });
+
+            var environment = new TestEnvironment(new Dictionary<string, string>
+            {
+                { EnvironmentSettingNames.AzureWebJobsFeatureFlags, ScriptConstants.FeatureFlagEnableProxies },
+            });
+            var eventManager = new ScriptEventManager();
+            var loggerFactory = new LoggerFactory();
+            var testLogger = new TestLogger("Startup");
+            loggerFactory.AddProvider(new TestLoggerProvider(testLogger));
+
+            var provider = new ProxyFunctionProvider(options, environment, eventManager, loggerFactory);
+
+            var warningLog = testLogger.GetLogMessages().FirstOrDefault(m =>
+                m.Level == LogLevel.Warning &&
+                m.State is IDictionary<string, object> state &&
+                state.ContainsKey(ScriptConstants.ErrorCodeKey) &&
+                state[ScriptConstants.ErrorCodeKey].ToString() == DiagnosticEventConstants.DeprecatedProxiesErrorCode);
+
+            Assert.NotNull(warningLog);
+            Assert.Contains("Azure Functions Proxies are deprecated", warningLog.FormattedMessage);
+            Assert.Contains("September 30, 2025", warningLog.FormattedMessage);
+        }
     }
 }