diff --git a/ILSpy/Commands/FileCommands.cs b/ILSpy/Commands/FileCommands.cs
index f37f97860..d7e64420d 100644
--- a/ILSpy/Commands/FileCommands.cs
+++ b/ILSpy/Commands/FileCommands.cs
@@ -96,7 +96,23 @@ namespace ILSpy.Commands
 	[Shared]
 	sealed class ManageAssemblyListsCommand : SimpleCommand
 	{
-		public override void Execute(object? parameter) => NotImplementedDialog.Show(Resources.ManageAssembly_Lists);
+		readonly SettingsService settingsService;
+
+		[ImportingConstructor]
+		public ManageAssemblyListsCommand(SettingsService settingsService)
+		{
+			this.settingsService = settingsService;
+		}
+
+		public override void Execute(object? parameter)
+		{
+			var owner = (global::Avalonia.Application.Current?.ApplicationLifetime
+				as global::Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime)?.MainWindow;
+			if (owner == null)
+				return;
+			var dlg = new Views.ManageAssemblyListsDialog(settingsService);
+			_ = dlg.ShowDialog(owner);
+		}
 	}
 
 	[ExportMainMenuCommand(ParentMenuID = nameof(Resources._File), Header = nameof(Resources._Reload), MenuIcon = "Images/Refresh", MenuCategory = nameof(Resources.Open), MenuOrder = 2, InputGestureText = "F5")]
diff --git a/ILSpy/Views/CreateListDialog.axaml b/ILSpy/Views/CreateListDialog.axaml
new file mode 100644
index 000000000..8fa1ffc9d
--- /dev/null
+++ b/ILSpy/Views/CreateListDialog.axaml
@@ -0,0 +1,15 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="ILSpy.Views.CreateListDialog"
+        Width="320" Height="160" CanResize="False"
+        WindowStartupLocation="CenterOwner"
+        Title="ILSpy">
+	<Grid Margin="12,8" RowDefinitions="Auto,Auto,*,Auto">
+		<TextBlock Grid.Row="0" Text="Enter the name of the list:" Margin="0,0,0,6" />
+		<TextBox Grid.Row="1" Name="ListNameBox" Margin="0,4" />
+		<StackPanel Grid.Row="3" Orientation="Horizontal" HorizontalAlignment="Right" Spacing="6">
+			<Button Name="OkButton" Content="OK" IsDefault="True" IsEnabled="False" MinWidth="72" />
+			<Button Name="CancelButton" Content="Cancel" IsCancel="True" MinWidth="72" />
+		</StackPanel>
+	</Grid>
+</Window>
diff --git a/ILSpy/Views/CreateListDialog.axaml.cs b/ILSpy/Views/CreateListDialog.axaml.cs
new file mode 100644
index 000000000..a01cbdc46
--- /dev/null
+++ b/ILSpy/Views/CreateListDialog.axaml.cs
@@ -0,0 +1,58 @@
+// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace ILSpy.Views
+{
+	/// <summary>
+	/// Modal prompt for a single text field — used by ManageAssemblyListsDialog's
+	/// New / Clone / Rename / Add-Preconfigured flows. Returns the entered name via
+	/// <see cref="Window.ShowDialog{TResult}"/>'s string result, or <c>null</c> if
+	/// the user cancelled. Title and initial text are passed in by the caller so the
+	/// same window backs all four flows.
+	/// </summary>
+	public partial class CreateListDialog : Window
+	{
+		TextBox listNameBox = null!;
+		Button okButton = null!;
+
+		public CreateListDialog()
+		{
+			InitializeComponent();
+			listNameBox = this.FindControl<TextBox>("ListNameBox")!;
+			okButton = this.FindControl<Button>("OkButton")!;
+			listNameBox.TextChanged += (_, _) => okButton.IsEnabled = !string.IsNullOrWhiteSpace(listNameBox.Text);
+			okButton.Click += (_, _) => Close(listNameBox.Text);
+			((Button)this.FindControl<Button>("CancelButton")!).Click += (_, _) => Close(null);
+		}
+
+		public CreateListDialog(string title, string? initialText = null) : this()
+		{
+			Title = title;
+			if (!string.IsNullOrEmpty(initialText))
+			{
+				listNameBox.Text = initialText;
+				listNameBox.SelectAll();
+			}
+		}
+
+		void InitializeComponent() => AvaloniaXamlLoader.Load(this);
+	}
+}
diff --git a/ILSpy/Views/ManageAssemblyListsDialog.axaml b/ILSpy/Views/ManageAssemblyListsDialog.axaml
new file mode 100644
index 000000000..eb92e7ff8
--- /dev/null
+++ b/ILSpy/Views/ManageAssemblyListsDialog.axaml
@@ -0,0 +1,21 @@
+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="ILSpy.Views.ManageAssemblyListsDialog"
+        Width="480" Height="350" MinWidth="480" MinHeight="250"
+        WindowStartupLocation="CenterOwner"
+        Title="Manage Assembly Lists">
+	<Grid Margin="12,8" ColumnDefinitions="*,Auto" RowDefinitions="*,Auto">
+		<ListBox Grid.Row="0" Grid.Column="0" Name="ListsBox" Margin="0,8,8,8" SelectionMode="Single" />
+		<StackPanel Grid.Row="0" Grid.Column="1" Margin="4,8" Spacing="4" MinWidth="100">
+			<Button Name="NewButton" Content="_New" />
+			<Button Name="CloneButton" Content="C_lone" />
+			<Button Name="RenameButton" Content="R_ename" />
+			<Button Name="DeleteButton" Content="_Delete" />
+			<Button Name="ResetButton" Margin="0,12,0,0" Content="_Reset" />
+		</StackPanel>
+		<StackPanel Grid.Row="1" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Right" Spacing="6">
+			<Button Name="SelectButton" Content="Select" IsDefault="True" MinWidth="72" />
+			<Button Name="CloseButton" Content="Close" IsCancel="True" MinWidth="72" />
+		</StackPanel>
+	</Grid>
+</Window>
diff --git a/ILSpy/Views/ManageAssemblyListsDialog.axaml.cs b/ILSpy/Views/ManageAssemblyListsDialog.axaml.cs
new file mode 100644
index 000000000..cbb5a19b2
--- /dev/null
+++ b/ILSpy/Views/ManageAssemblyListsDialog.axaml.cs
@@ -0,0 +1,140 @@
+// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+using ICSharpCode.ILSpyX;
+
+namespace ILSpy.Views
+{
+	/// <summary>
+	/// Manage Assembly Lists dialog: list of saved assembly-list names with New / Clone /
+	/// Rename / Delete / Reset operations + a Select button that swaps the active list.
+	/// Mirrors WPF's <c>ManageAssemblyListsDialog</c>; all CRUD ops route through the
+	/// shared <see cref="AssemblyListManager"/>.
+	/// </summary>
+	public partial class ManageAssemblyListsDialog : Window
+	{
+		readonly SettingsService settingsService;
+		readonly AssemblyListManager manager;
+		readonly ListBox listsBox;
+
+		public ManageAssemblyListsDialog() : this(NullSettingsService()) { }
+
+		public ManageAssemblyListsDialog(SettingsService settingsService)
+		{
+			InitializeComponent();
+			this.settingsService = settingsService;
+			this.manager = settingsService.AssemblyListManager;
+			listsBox = this.FindControl<ListBox>("ListsBox")!;
+			listsBox.ItemsSource = manager.AssemblyLists;
+			WireButtons();
+		}
+
+		void InitializeComponent() => AvaloniaXamlLoader.Load(this);
+
+		// Design-time-only no-op fallback so XAML preview doesn't blow up on the null
+		// SettingsService when a designer instantiates the dialog without composition.
+		static SettingsService NullSettingsService()
+			=> AppEnv.AppComposition.Current.GetExport<SettingsService>();
+
+		void WireButtons()
+		{
+			this.FindControl<Button>("NewButton")!.Click += async (_, _) => await NewListAsync();
+			this.FindControl<Button>("CloneButton")!.Click += async (_, _) => await CloneListAsync();
+			this.FindControl<Button>("RenameButton")!.Click += async (_, _) => await RenameListAsync();
+			this.FindControl<Button>("DeleteButton")!.Click += (_, _) => DeleteList();
+			this.FindControl<Button>("ResetButton")!.Click += (_, _) => ResetLists();
+			this.FindControl<Button>("SelectButton")!.Click += (_, _) => SelectAndClose();
+			this.FindControl<Button>("CloseButton")!.Click += (_, _) => Close();
+		}
+
+		string? SelectedListName => listsBox.SelectedItem as string;
+
+		async Task<string?> PromptAsync(string title, string? initialText = null)
+		{
+			var dlg = new CreateListDialog(title, initialText);
+			return await dlg.ShowDialog<string?>(this);
+		}
+
+		async Task NewListAsync()
+		{
+			var name = await PromptAsync("New Assembly List");
+			if (string.IsNullOrWhiteSpace(name) || manager.AssemblyLists.Contains(name))
+				return;
+			var list = manager.CreateList(name);
+			manager.AddListIfNotExists(list);
+		}
+
+		async Task CloneListAsync()
+		{
+			if (SelectedListName is not { } selected)
+				return;
+			var name = await PromptAsync("Clone Assembly List");
+			if (string.IsNullOrWhiteSpace(name) || manager.AssemblyLists.Contains(name))
+				return;
+			manager.CloneList(selected, name);
+		}
+
+		async Task RenameListAsync()
+		{
+			if (SelectedListName is not { } selected)
+				return;
+			var name = await PromptAsync("Rename Assembly List", selected);
+			if (string.IsNullOrWhiteSpace(name) || name == selected || manager.AssemblyLists.Contains(name))
+				return;
+			manager.RenameList(selected, name);
+			if (settingsService.SessionSettings.ActiveAssemblyList == selected)
+				settingsService.SessionSettings.ActiveAssemblyList = name;
+		}
+
+		void DeleteList()
+		{
+			if (SelectedListName is not { } selected)
+				return;
+			int index = manager.AssemblyLists.IndexOf(selected);
+			manager.DeleteList(selected);
+			if (manager.AssemblyLists.Count > 0)
+			{
+				listsBox.SelectedIndex = Math.Max(0, index - 1);
+				if (settingsService.SessionSettings.ActiveAssemblyList == selected)
+					settingsService.SessionSettings.ActiveAssemblyList = manager.AssemblyLists[Math.Max(0, index - 1)];
+			}
+		}
+
+		void ResetLists()
+		{
+			manager.ClearAll();
+			manager.CreateDefaultAssemblyLists();
+			if (manager.AssemblyLists.Count > 0)
+				settingsService.SessionSettings.ActiveAssemblyList = manager.AssemblyLists[0];
+		}
+
+		void SelectAndClose()
+		{
+			if (SelectedListName is { } selected)
+				settingsService.SessionSettings.ActiveAssemblyList = selected;
+			Close();
+		}
+	}
+}