diff --git a/weak/src/jvmMain/kotlin/algorithms/JvmWeakHashMap.kt b/weak/src/jvmMain/kotlin/algorithms/JvmWeakHashMap.kt
new file mode 100644
index 0000000..15a5d81
--- /dev/null
+++ b/weak/src/jvmMain/kotlin/algorithms/JvmWeakHashMap.kt
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2025, OpenSavvy and contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License 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 opensavvy.pedestal.weak.algorithms
+
+import opensavvy.pedestal.weak.ExperimentalWeakApi
+import opensavvy.pedestal.weak.WeakMap
+import java.util.*
+
+private class JvmWeakHashMap<K, V>(
+	private val java: WeakHashMap<K, V>,
+) : WeakMap<K, V> {
+
+	override fun get(key: K): V? =
+		java[key]
+
+	override fun set(key: K, value: V) {
+		java[key] = value
+	}
+
+	@ExperimentalWeakApi
+	override fun contains(key: K): Boolean =
+		key in java
+
+	@ExperimentalWeakApi
+	override fun remove(key: K): V? =
+		java.remove(key)
+
+}
+
+/**
+ * Wraps a JVM [WeakHashMap] into a multiplatform [WeakMap].
+ *
+ * The resulting weak map has the exact same properties as the JVM map.
+ * Most importantly:
+ * - The keys are held weakly.
+ * - The values are held strongly.
+ * - The map is not thread-safe.
+ */
+@ExperimentalWeakApi
+fun <K, V> WeakHashMap<K, V>.asMultiplatform(): WeakMap<K, V> =
+	JvmWeakHashMap(this)