diff --git a/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsCredentialsProviderSystemSetting.java b/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsCredentialsProviderSystemSetting.java
new file mode 100644
index 000000000000..d5026a3da255
--- /dev/null
+++ b/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsCredentialsProviderSystemSetting.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License").
+ * You may not use this file except in compliance with the License.
+ * A copy of the License is located at
+ *
+ *  http://aws.amazon.com/apache2.0
+ *
+ * or in the "license" file accompanying this file. This file is distributed
+ * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package software.amazon.awssdk.services.sts.internal;
+
+import software.amazon.awssdk.annotations.SdkProtectedApi;
+import software.amazon.awssdk.utils.SystemSetting;
+
+/**
+ * STS credentials provider specific system setting
+ */
+@SdkProtectedApi
+public enum StsCredentialsProviderSystemSetting implements SystemSetting {
+
+    /**
+     * Configure the custom STS endpoint
+     */
+    AWS_ENDPOINT_URL_STS("aws.endpointSTS", null);
+
+    private final String systemProperty;
+    private final String defaultValue;
+
+    StsCredentialsProviderSystemSetting(String systemProperty, String defaultValue) {
+        this.systemProperty = systemProperty;
+        this.defaultValue = defaultValue;
+    }
+
+    @Override
+    public String property() {
+        return systemProperty;
+    }
+
+    @Override
+    public String environmentVariable() {
+        return name();
+    }
+
+    @Override
+    public String defaultValue() {
+        return defaultValue;
+    }
+}
diff --git a/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsProfileCredentialsProviderFactory.java b/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsProfileCredentialsProviderFactory.java
index 4e5559e73680..6a1709388354 100644
--- a/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsProfileCredentialsProviderFactory.java
+++ b/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsProfileCredentialsProviderFactory.java
@@ -15,6 +15,8 @@
 
 package software.amazon.awssdk.services.sts.internal;
 
+import static software.amazon.awssdk.services.sts.internal.StsCredentialsProviderSystemSetting.AWS_ENDPOINT_URL_STS;
+
 import java.net.URI;
 import software.amazon.awssdk.annotations.SdkInternalApi;
 import software.amazon.awssdk.auth.credentials.AwsCredentials;
@@ -96,6 +98,12 @@ private void configureEndpoint(StsClientBuilder stsClientBuilder, Profile profil
                 stsClientBuilder.region(Region.US_EAST_1);
                 stsClientBuilder.endpointOverride(URI.create("https://sts.amazonaws.com"));
             }
+
+            // Set custom STS endpoint if it's specified
+            if (AWS_ENDPOINT_URL_STS.getStringValue().isPresent()) {
+                stsClientBuilder.endpointOverride(URI.create(
+                    AWS_ENDPOINT_URL_STS.getStringValue().get()));
+            }
         }
 
         private String requireProperty(Profile profile, String requiredProperty) {
diff --git a/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsWebIdentityCredentialsProviderFactory.java b/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsWebIdentityCredentialsProviderFactory.java
index 86340d4f857d..25a6d1e4aa8e 100644
--- a/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsWebIdentityCredentialsProviderFactory.java
+++ b/services/sts/src/main/java/software/amazon/awssdk/services/sts/internal/StsWebIdentityCredentialsProviderFactory.java
@@ -15,6 +15,8 @@
 
 package software.amazon.awssdk.services.sts.internal;
 
+import static software.amazon.awssdk.services.sts.internal.StsCredentialsProviderSystemSetting.AWS_ENDPOINT_URL_STS;
+
 import java.net.URI;
 import software.amazon.awssdk.annotations.SdkProtectedApi;
 import software.amazon.awssdk.auth.credentials.AnonymousCredentialsProvider;
@@ -129,6 +131,12 @@ private void configureEndpoint(StsClientBuilder stsClientBuilder) {
                 stsClientBuilder.region(Region.US_EAST_1);
                 stsClientBuilder.endpointOverride(URI.create("https://sts.amazonaws.com"));
             }
+
+            // Set custom STS endpoint if it's specified
+            if (AWS_ENDPOINT_URL_STS.getStringValue().isPresent()) {
+                stsClientBuilder.endpointOverride(URI.create(
+                    AWS_ENDPOINT_URL_STS.getStringValue().get()));
+            }
         }
     }
 }