diff --git a/junit-jupiter-api/src/main/java/org/junit/jupiter/api/AssertionUtils.java b/junit-jupiter-api/src/main/java/org/junit/jupiter/api/AssertionUtils.java
index 6ae0c48536a7..05165b58e83c 100644
--- a/junit-jupiter-api/src/main/java/org/junit/jupiter/api/AssertionUtils.java
+++ b/junit-jupiter-api/src/main/java/org/junit/jupiter/api/AssertionUtils.java
@@ -17,6 +17,7 @@
 import java.util.function.Supplier;
 
 import org.jspecify.annotations.Nullable;
+import org.junit.platform.commons.JUnitException;
 import org.junit.platform.commons.annotation.Contract;
 import org.junit.platform.commons.util.UnrecoverableExceptions;
 
@@ -27,7 +28,6 @@
  * @since 5.0
  */
 class AssertionUtils {
-
 	private AssertionUtils() {
 		/* no-op */
 	}
@@ -129,6 +129,15 @@ static boolean objectsAreEqual(@Nullable Object obj1, @Nullable Object obj2) {
 		if (obj1 == null) {
 			return (obj2 == null);
 		}
+		if (obj2 == null) {
+			return false;
+		}
+		if (Boolean.getBoolean("junit.jupiter.disallow.arrays.in.equals.checks")) {
+			if (obj1.getClass().isArray() && obj2.getClass().isArray()) {
+				throw new JUnitException(
+					"Detected array arguments:" + " " + obj1.getClass() + " and " + obj2.getClass());
+			}
+		}
 		return obj1.equals(obj2);
 	}
 
diff --git a/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertEqualsAssertionsTests.java b/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertEqualsAssertionsTests.java
index ec30168e7605..884952353cd0 100644
--- a/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertEqualsAssertionsTests.java
+++ b/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertEqualsAssertionsTests.java
@@ -19,6 +19,7 @@
 import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import org.junit.jupiter.api.function.Executable;
+import org.junit.platform.commons.JUnitException;
 import org.opentest4j.AssertionFailedError;
 
 /**
@@ -750,6 +751,25 @@ void chars() {
 
 	}
 
+	@Nested
+	class ArraysAsArguments {
+		@Test
+		void objects() {
+			Object object = new Object();
+			Object array1 = new Object[] { object };
+			Object array2 = new Object[] { object };
+			try {
+				System.setProperty("junit.jupiter.disallow.arrays.in.equals.checks", "true");
+				var exception = assertThrows(JUnitException.class, () -> assertEquals(array1, array2));
+				assertEquals("Detected array arguments: class [Ljava.lang.Object; and class [Ljava.lang.Object;",
+					exception.getMessage());
+			}
+			finally {
+				System.clearProperty("junit.jupiter.disallow.arrays.in.equals.checks");
+			}
+		}
+	}
+
 	// -------------------------------------------------------------------------
 
 	@SuppressWarnings("overrides")
diff --git a/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertNotEqualsAssertionsTests.java b/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertNotEqualsAssertionsTests.java
index 842e7f463a8f..15ab15226f14 100644
--- a/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertNotEqualsAssertionsTests.java
+++ b/jupiter-tests/src/test/java/org/junit/jupiter/api/AssertNotEqualsAssertionsTests.java
@@ -14,9 +14,16 @@
 import static org.junit.jupiter.api.AssertionTestUtils.assertMessageEquals;
 import static org.junit.jupiter.api.AssertionTestUtils.assertMessageStartsWith;
 import static org.junit.jupiter.api.AssertionTestUtils.expectAssertionFailedError;
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertSame;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.util.Arrays;
+
+import org.junit.platform.commons.JUnitException;
 import org.opentest4j.AssertionFailedError;
 
 /**
@@ -624,6 +631,30 @@ void assertNotEqualsInvokesEqualsMethodForIdenticalObjects() {
 
 	}
 
+	@Nested
+	class AssertNotEqualsArrays {
+		@Test
+		void objects() {
+			Object object = new Object();
+			Object array1 = new Object[] { object };
+			Object array2 = new Object[] { object };
+			assertThrows(AssertionFailedError.class, () -> assertSame(array1, array2));
+			assertThrows(AssertionFailedError.class, () -> assertEquals(array1, array2));
+			assertNotEquals(array1, array2); // succeeds
+			assertTrue(Arrays.deepEquals((Object[]) array1, (Object[]) array2));
+			assertArrayEquals((Object[]) array1, (Object[]) array2);
+			try {
+				System.setProperty("junit.jupiter.disallow.arrays.in.equals.checks", "true");
+				var exception = assertThrows(JUnitException.class, () -> assertNotEquals(array1, array2));
+				assertEquals("Detected array arguments: class [Ljava.lang.Object; and class [Ljava.lang.Object;",
+					exception.getMessage());
+			}
+			finally {
+				System.clearProperty("junit.jupiter.disallow.arrays.in.equals.checks");
+			}
+		}
+	}
+
 	// -------------------------------------------------------------------------
 
 	@Nested