diff --git a/hadoop-hdds/client/src/main/java/org/apache/hadoop/ozone/client/io/ECBlockReconstructedStripeInputStream.java b/hadoop-hdds/client/src/main/java/org/apache/hadoop/ozone/client/io/ECBlockReconstructedStripeInputStream.java
index c71db0e41ed4..672894f186f1 100644
--- a/hadoop-hdds/client/src/main/java/org/apache/hadoop/ozone/client/io/ECBlockReconstructedStripeInputStream.java
+++ b/hadoop-hdds/client/src/main/java/org/apache/hadoop/ozone/client/io/ECBlockReconstructedStripeInputStream.java
@@ -727,6 +727,11 @@ protected int readWithStrategy(ByteReaderStrategy strategy) {
   public synchronized void close() {
     super.close();
     freeBuffers();
+    if (decoder != null) {
+      // Release the decoder's native resources (e.g. ISA-L coder context)
+      // that were allocated lazily in init().
+      decoder.release();
+    }
   }
 
   @Override
diff --git a/hadoop-hdds/client/src/test/java/org/apache/hadoop/ozone/client/io/TestECBlockReconstructedStripeInputStream.java b/hadoop-hdds/client/src/test/java/org/apache/hadoop/ozone/client/io/TestECBlockReconstructedStripeInputStream.java
index 8589a2b73f40..f6892940a069 100644
--- a/hadoop-hdds/client/src/test/java/org/apache/hadoop/ozone/client/io/TestECBlockReconstructedStripeInputStream.java
+++ b/hadoop-hdds/client/src/test/java/org/apache/hadoop/ozone/client/io/TestECBlockReconstructedStripeInputStream.java
@@ -26,6 +26,10 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mockStatic;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
 
 import com.google.common.collect.ImmutableSet;
 import java.io.IOException;
@@ -52,11 +56,15 @@
 import org.apache.hadoop.io.ElasticByteBufferPool;
 import org.apache.hadoop.ozone.client.io.ECStreamTestUtil.TestBlockInputStream;
 import org.apache.hadoop.ozone.client.io.ECStreamTestUtil.TestBlockInputStreamFactory;
+import org.apache.ozone.erasurecode.rawcoder.RSRawErasureCoderFactory;
+import org.apache.ozone.erasurecode.rawcoder.RawErasureDecoder;
+import org.apache.ozone.erasurecode.rawcoder.util.CodecUtil;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
+import org.mockito.MockedStatic;
 
 /**
  * Test for the ECBlockReconstructedStripeInputStream.
@@ -807,6 +815,40 @@ public void testFailedLocationsAreNotRead() throws IOException {
     }
   }
 
+  @Test
+  public void testDecoderReleasedOnClose() throws IOException {
+    // The stream must release its RawErasureDecoder on close so the decoder's
+    // native resources (e.g. ISA-L coder context) are not leaked. The decoder
+    // is created lazily in init() on the first read.
+    int chunkSize = repConfig.getEcChunkSize();
+    int blockLength = chunkSize * repConfig.getData();
+    ByteBuffer[] dataBufs = allocateBuffers(repConfig.getData(), chunkSize);
+    ECStreamTestUtil.randomFill(dataBufs, chunkSize, dataGen, blockLength);
+    ByteBuffer[] parity = generateParity(dataBufs, repConfig);
+    addDataStreamsToFactory(dataBufs, parity);
+
+    // Data index 1 is missing, so a read must build the decoder to reconstruct.
+    Map<DatanodeDetails, Integer> dnMap =
+        ECStreamTestUtil.createIndexMap(2, 3, 4, 5);
+    BlockLocationInfo keyInfo =
+        ECStreamTestUtil.createKeyInfo(repConfig, blockLength, dnMap);
+    streamFactory.setCurrentPipeline(keyInfo.getPipeline());
+
+    RawErasureDecoder spyDecoder =
+        spy(new RSRawErasureCoderFactory().createDecoder(repConfig));
+    ByteBuffer[] bufs = allocateByteBuffers(repConfig);
+    try (MockedStatic<CodecUtil> mocked = mockStatic(CodecUtil.class)) {
+      mocked.when(() -> CodecUtil.createRawDecoderWithFallback(any()))
+          .thenReturn(spyDecoder);
+      try (ECBlockReconstructedStripeInputStream ecBlockReconstructedStripeInputStream =
+          createInputStream(keyInfo)) {
+        // The read triggers init(), which creates the (spied) decoder.
+        ecBlockReconstructedStripeInputStream.read(bufs);
+      }
+    }
+    verify(spyDecoder).release();
+  }
+
   private ECBlockReconstructedStripeInputStream createInputStream(
       BlockLocationInfo keyInfo) {
     OzoneClientConfig clientConfig = conf.getObject(OzoneClientConfig.class);
diff --git a/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java b/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java
index 9f94384d4df2..d757256aeef7 100644
--- a/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java
+++ b/hadoop-ozone/client/src/main/java/org/apache/hadoop/ozone/client/io/ECKeyOutputStream.java
@@ -499,6 +499,9 @@ public void close() throws IOException {
     } finally {
       closeCurrentStreamEntry();
       blockOutputStreamEntryPool.cleanup();
+      // Release the encoder's native resources (e.g. ISA-L coder context)
+      // that were allocated in the constructor.
+      encoder.release();
     }
   }
 
diff --git a/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestOzoneECClient.java b/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestOzoneECClient.java
index 6317baac800d..502e11a30950 100644
--- a/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestOzoneECClient.java
+++ b/hadoop-ozone/client/src/test/java/org/apache/hadoop/ozone/client/TestOzoneECClient.java
@@ -22,6 +22,10 @@
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertInstanceOf;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mockStatic;
+import static org.mockito.Mockito.spy;
+import static org.mockito.Mockito.verify;
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
@@ -64,11 +68,13 @@
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos;
 import org.apache.ozone.erasurecode.rawcoder.RSRawErasureCoderFactory;
 import org.apache.ozone.erasurecode.rawcoder.RawErasureEncoder;
+import org.apache.ozone.erasurecode.rawcoder.util.CodecUtil;
 import org.apache.ozone.test.GenericTestUtils;
 import org.apache.ratis.thirdparty.com.google.protobuf.ByteString;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
+import org.mockito.MockedStatic;
 
 /**
  * Real unit test for OzoneECClient.
@@ -604,6 +610,21 @@ public void test10D4PConfigWithPartialStripe()
     }
   }
 
+  @Test
+  public void testEncoderReleasedOnClose() throws IOException {
+    // The ECKeyOutputStream must release its RawErasureEncoder on close so the
+    // encoder's native resources (e.g. ISA-L coder context) are not leaked.
+    RawErasureEncoder spyEncoder = spy(new RSRawErasureCoderFactory()
+        .createEncoder(new ECReplicationConfig(dataBlocks, parityBlocks)));
+    try (MockedStatic<CodecUtil> mocked = mockStatic(CodecUtil.class)) {
+      mocked.when(() -> CodecUtil.createRawEncoderWithFallback(any()))
+          .thenReturn(spyEncoder);
+      // Creates the ECKeyOutputStream (picks up the spy encoder) and closes it.
+      writeIntoECKey(inputChunks, keyName, null);
+    }
+    verify(spyEncoder).release();
+  }
+
   @Test
   public void testWriteShouldFailIfMoreThanParityNodesFail()
       throws Exception {