diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7d3d894..29a70fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - X10D: Add support for generic math interfaces.
 - X10D: Added extension methods for `DateOnly`, for parity with `DateTime` and `DateTimeOffset`.
 - X10D: Added math-related extension methods for `BigInteger`.
+- X10D: Added `Queue<T>.EnqueueAll` and `Queue<T>.DequeueAll`.
+- X10D: Added `Stack<T>.PushAll` and `Stack<T>.PopAll`.
 - X10D: Added `Span<T>.Replace(T, T)`.
 - X10D: Added `CountDigits` for integer types.
 - X10D: Added `IEnumerable<T>.Except(T)`.
diff --git a/X10D.Tests/src/Collections/QueueTests.cs b/X10D.Tests/src/Collections/QueueTests.cs
new file mode 100644
index 0000000..5395beb
--- /dev/null
+++ b/X10D.Tests/src/Collections/QueueTests.cs
@@ -0,0 +1,68 @@
+using NUnit.Framework;
+using X10D.Collections;
+
+namespace X10D.Tests.Collections;
+
+[TestFixture]
+internal class QueueTests
+{
+    [Test]
+    public void EnqueueAll_ShouldThrowArgumentNullException_GivenNullQueue()
+    {
+        Queue<int> queue = null!;
+        Assert.Throws<ArgumentNullException>(() => queue.EnqueueAll([]));
+    }
+
+    [Test]
+    public void EnqueueAll_ShouldThrowArgumentNullException_GivenNullElements()
+    {
+        var queue = new Queue<int>();
+        Assert.Throws<ArgumentNullException>(() => queue.EnqueueAll(null!));
+    }
+
+    [Test]
+    public void DequeueAll_ShouldThrowArgumentNullException_GivenNullQueue()
+    {
+        Queue<int> queue = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = queue.DequeueAll().ToArray());
+    }
+
+    [Test]
+    public void EnqueueAll_ShouldAddElementsToQueue_GivenValidEnumerable()
+    {
+        var queue = new Queue<int>();
+        int[] elements = [1, 2, 3, 4, 5];
+
+        Assert.That(queue, Is.Empty);
+
+        queue.EnqueueAll(elements);
+
+        Assert.That(queue, Is.Not.Empty);
+        Assert.That(queue, Has.Count.EqualTo(5));
+
+        var index = 0;
+        foreach (int i in queue)
+        {
+            Assert.That(i, Is.EqualTo(elements[index]));
+            index++;
+        }
+    }
+
+    [Test]
+    public void DequeueAll_ShouldRemoveElementsFromQueue()
+    {
+        var queue = new Queue<int>([1, 2, 3, 4, 5]);
+
+        Assert.That(queue, Is.Not.Empty);
+        Assert.That(queue, Has.Count.EqualTo(5));
+
+        var index = 1;
+        foreach (int i in queue.DequeueAll())
+        {
+            Assert.That(i, Is.EqualTo(index));
+            index++;
+        }
+
+        Assert.That(queue, Is.Empty);
+    }
+}
diff --git a/X10D.Tests/src/Collections/StackTests.cs b/X10D.Tests/src/Collections/StackTests.cs
new file mode 100644
index 0000000..ab02fbc
--- /dev/null
+++ b/X10D.Tests/src/Collections/StackTests.cs
@@ -0,0 +1,68 @@
+using NUnit.Framework;
+using X10D.Collections;
+
+namespace X10D.Tests.Collections;
+
+[TestFixture]
+internal class StackTests
+{
+    [Test]
+    public void PushAll_ShouldThrowArgumentNullException_GivenNullStack()
+    {
+        Stack<int> stack = null!;
+        Assert.Throws<ArgumentNullException>(() => stack.PushAll([]));
+    }
+
+    [Test]
+    public void PushAll_ShouldThrowArgumentNullException_GivenNullElements()
+    {
+        var stack = new Stack<int>();
+        Assert.Throws<ArgumentNullException>(() => stack.PushAll(null!));
+    }
+
+    [Test]
+    public void PopAll_ShouldThrowArgumentNullException_GivenNullStack()
+    {
+        Stack<int> stack = null!;
+        Assert.Throws<ArgumentNullException>(() => _ = stack.PopAll().ToArray());
+    }
+
+    [Test]
+    public void PushAll_ShouldAddElementsToStack_GivenValidEnumerable()
+    {
+        var stack = new Stack<int>();
+        int[] elements = [1, 2, 3, 4, 5];
+
+        Assert.That(stack, Is.Empty);
+
+        stack.PushAll(elements);
+
+        Assert.That(stack, Is.Not.Empty);
+        Assert.That(stack, Has.Count.EqualTo(5));
+
+        var index = 4;
+        foreach (int i in stack)
+        {
+            Assert.That(i, Is.EqualTo(elements[index]));
+            index--;
+        }
+    }
+
+    [Test]
+    public void PopAll_ShouldRemoveElementsFromStack()
+    {
+        var stack = new Stack<int>([1, 2, 3, 4, 5]);
+
+        Assert.That(stack, Is.Not.Empty);
+        Assert.That(stack, Has.Count.EqualTo(5));
+
+        var index = 5;
+        foreach (int i in stack.PopAll())
+        {
+            Assert.That(i, Is.EqualTo(index));
+            index--;
+        }
+
+        Assert.That(stack, Is.Empty);
+    }
+}
diff --git a/X10D/src/Collections/QueueExtensions.cs b/X10D/src/Collections/QueueExtensions.cs
new file mode 100644
index 0000000..f8b2447
--- /dev/null
+++ b/X10D/src/Collections/QueueExtensions.cs
@@ -0,0 +1,56 @@
+namespace X10D.Collections;
+
+/// <summary>
+///     Extension methods for <see cref="Queue{T}" />.
+/// </summary>
+public static class QueueExtensions
+{
+    /// <summary>
+    ///     Adds an enumerable collection of objects to the end of the <see cref="Queue{T}" />, in the order that they were
+    ///     enumerated.
+    /// </summary>
+    /// <param name="queue">The queue to which the elements will be added.</param>
+    /// <param name="values">An enumerable collection of elements to enqueue.</param>
+    /// <typeparam name="TElement">The type of the element.</typeparam>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="queue" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="values" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void EnqueueAll<TElement>(this Queue<TElement> queue, IEnumerable<TElement> values)
+    {
+        if (queue is null)
+        {
+            throw new ArgumentNullException(nameof(queue));
+        }
+
+        if (values is null)
+        {
+            throw new ArgumentNullException(nameof(values));
+        }
+
+        foreach (TElement element in values)
+        {
+            queue.Enqueue(element);
+        }
+    }
+
+    /// <summary>
+    ///     Removes and returns each element from the queue starting at the beginning, until the queue is empty.
+    /// </summary>
+    /// <param name="queue">The queue from which the elements will be removed.</param>
+    /// <typeparam name="TElement">The type of the element.</typeparam>
+    /// <exception cref="ArgumentNullException"><paramref name="queue" /> is <see langword="null" />.</exception>
+    public static IEnumerable<TElement> DequeueAll<TElement>(this Queue<TElement> queue)
+    {
+        if (queue is null)
+        {
+            throw new ArgumentNullException(nameof(queue));
+        }
+
+        while (queue.Count > 0)
+        {
+            yield return queue.Dequeue();
+        }
+    }
+}
diff --git a/X10D/src/Collections/StackExtensions.cs b/X10D/src/Collections/StackExtensions.cs
new file mode 100644
index 0000000..a0d3a9e
--- /dev/null
+++ b/X10D/src/Collections/StackExtensions.cs
@@ -0,0 +1,56 @@
+namespace X10D.Collections;
+
+/// <summary>
+///     Extension methods for <see cref="Stack{T}" />.
+/// </summary>
+public static class StackExtensions
+{
+    /// <summary>
+    ///     Adds an enumerable collection of objects to the top of the <see cref="Stack{T}" />, in the order that they were
+    ///     enumerated.
+    /// </summary>
+    /// <param name="stack">The stack to which the elements will be added.</param>
+    /// <param name="values">An enumerable collection of elements to push.</param>
+    /// <typeparam name="TElement">The type of the element.</typeparam>
+    /// <exception cref="ArgumentNullException">
+    ///     <para><paramref name="stack" /> is <see langword="null" />.</para>
+    ///     -or-
+    ///     <para><paramref name="values" /> is <see langword="null" />.</para>
+    /// </exception>
+    public static void PushAll<TElement>(this Stack<TElement> stack, IEnumerable<TElement> values)
+    {
+        if (stack is null)
+        {
+            throw new ArgumentNullException(nameof(stack));
+        }
+
+        if (values is null)
+        {
+            throw new ArgumentNullException(nameof(values));
+        }
+
+        foreach (TElement element in values)
+        {
+            stack.Push(element);
+        }
+    }
+
+    /// <summary>
+    ///     Removes and returns each element from the stack starting at the top, until the stack is empty.
+    /// </summary>
+    /// <param name="stack">The stack from which the elements will be removed.</param>
+    /// <typeparam name="TElement">The type of the element.</typeparam>
+    /// <exception cref="ArgumentNullException"><paramref name="stack" /> is <see langword="null" />.</exception>
+    public static IEnumerable<TElement> PopAll<TElement>(this Stack<TElement> stack)
+    {
+        if (stack is null)
+        {
+            throw new ArgumentNullException(nameof(stack));
+        }
+
+        while (stack.Count > 0)
+        {
+            yield return stack.Pop();
+        }
+    }
+}