diff --git a/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java b/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java
index b3f646d6099..58c7803346f 100644
--- a/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java
+++ b/core/src/main/java/io/grpc/internal/ProxyDetectorImpl.java
@@ -147,18 +147,9 @@ public ProxySelector get() {
         }
       };
 
-  /**
-   * Experimental environment variable name for enabling proxy support.
-   *
-   * @deprecated Use the standard Java proxy configuration instead with flags such as:
-   *     -Dhttps.proxyHost=HOST -Dhttps.proxyPort=PORT
-   */
-  @Deprecated
-  private static final String GRPC_PROXY_ENV_VAR = "GRPC_PROXY_EXP";
   // Do not hard code a ProxySelector because the global default ProxySelector can change
   private final Supplier<ProxySelector> proxySelector;
   private final AuthenticationProvider authenticationProvider;
-  private final InetSocketAddress overrideProxyAddress;
 
   // We want an HTTPS proxy, which operates on the entire data stream (See IETF rfc2817).
   static final String PROXY_SCHEME = "https";
@@ -168,21 +159,15 @@ public ProxySelector get() {
    * {@link ProxyDetectorImpl.AuthenticationProvider} to detect proxy parameters.
    */
   public ProxyDetectorImpl() {
-    this(DEFAULT_PROXY_SELECTOR, DEFAULT_AUTHENTICATOR, System.getenv(GRPC_PROXY_ENV_VAR));
+    this(DEFAULT_PROXY_SELECTOR, DEFAULT_AUTHENTICATOR);
   }
 
   @VisibleForTesting
   ProxyDetectorImpl(
       Supplier<ProxySelector> proxySelector,
-      AuthenticationProvider authenticationProvider,
-      @Nullable String proxyEnvString) {
+      AuthenticationProvider authenticationProvider) {
     this.proxySelector = checkNotNull(proxySelector);
     this.authenticationProvider = checkNotNull(authenticationProvider);
-    if (proxyEnvString != null) {
-      overrideProxyAddress = overrideProxy(proxyEnvString);
-    } else {
-      overrideProxyAddress = null;
-    }
   }
 
   @Nullable
@@ -191,12 +176,6 @@ public ProxiedSocketAddress proxyFor(SocketAddress targetServerAddress) throws I
     if (!(targetServerAddress instanceof InetSocketAddress)) {
       return null;
     }
-    if (overrideProxyAddress != null) {
-      return HttpConnectProxiedSocketAddress.newBuilder()
-          .setProxyAddress(overrideProxyAddress)
-          .setTargetAddress((InetSocketAddress) targetServerAddress)
-          .build();
-    }
     return detectProxy((InetSocketAddress) targetServerAddress);
   }
 
@@ -272,27 +251,6 @@ private ProxiedSocketAddress detectProxy(InetSocketAddress targetAddr) throws IO
         .build();
   }
 
-  /**
-   * GRPC_PROXY_EXP is deprecated but let's maintain compatibility for now.
-   */
-  private static InetSocketAddress overrideProxy(String proxyHostPort) {
-    if (proxyHostPort == null) {
-      return null;
-    }
-
-    String[] parts = proxyHostPort.split(":", 2);
-    int port = 80;
-    if (parts.length > 1) {
-      port = Integer.parseInt(parts[1]);
-    }
-    log.warning(
-        "Detected GRPC_PROXY_EXP and will honor it, but this feature will "
-            + "be removed in a future release. Use the JVM flags "
-            + "\"-Dhttps.proxyHost=HOST -Dhttps.proxyPort=PORT\" to set the https proxy for "
-            + "this JVM.");
-    return new InetSocketAddress(parts[0], port);
-  }
-
   /**
    * This interface makes unit testing easier by avoiding direct calls to static methods.
    */
diff --git a/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java b/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java
index 0432a474ac5..771050f119d 100644
--- a/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java
+++ b/core/src/test/java/io/grpc/internal/ProxyDetectorImplTest.java
@@ -73,7 +73,7 @@ public ProxySelector get() {
         return proxySelector;
       }
     };
-    proxyDetector = new ProxyDetectorImpl(proxySelectorSupplier, authenticator, null);
+    proxyDetector = new ProxyDetectorImpl(proxySelectorSupplier, authenticator);
     unresolvedProxy = InetSocketAddress.createUnresolved("10.0.0.1", proxyPort);
     proxySocketAddress = HttpConnectProxiedSocketAddress.newBuilder()
         .setTargetAddress(destination)
@@ -82,45 +82,6 @@ public ProxySelector get() {
         .build();
   }
 
-  @Test
-  public void override_hostPort() throws Exception {
-    final String overrideHost = "10.99.99.99";
-    final int overridePort = 1234;
-    final String overrideHostWithPort = overrideHost + ":" + overridePort;
-    ProxyDetectorImpl proxyDetector = new ProxyDetectorImpl(
-        proxySelectorSupplier,
-        authenticator,
-        overrideHostWithPort);
-    ProxiedSocketAddress detected = proxyDetector.proxyFor(destination);
-    assertNotNull(detected);
-    assertEquals(
-        HttpConnectProxiedSocketAddress.newBuilder()
-            .setTargetAddress(destination)
-            .setProxyAddress(
-                new InetSocketAddress(InetAddress.getByName(overrideHost), overridePort))
-            .build(),
-        detected);
-  }
-
-  @Test
-  public void override_hostOnly() throws Exception {
-    final String overrideHostWithoutPort = "10.99.99.99";
-    final int defaultPort = 80;
-    ProxyDetectorImpl proxyDetector = new ProxyDetectorImpl(
-        proxySelectorSupplier,
-        authenticator,
-        overrideHostWithoutPort);
-    ProxiedSocketAddress detected = proxyDetector.proxyFor(destination);
-    assertNotNull(detected);
-    assertEquals(
-        HttpConnectProxiedSocketAddress.newBuilder()
-            .setTargetAddress(destination)
-            .setProxyAddress(
-                new InetSocketAddress(InetAddress.getByName(overrideHostWithoutPort), defaultPort))
-            .build(),
-        detected);
-  }
-
   @Test
   public void returnNullWhenNoProxy() throws Exception {
     when(proxySelector.select(any(URI.class)))
@@ -227,8 +188,7 @@ public ProxySelector get() {
             return null;
           }
         },
-        authenticator,
-        null);
+        authenticator);
     assertNull(proxyDetector.proxyFor(destination));
   }
 }