diff --git a/README.md b/README.md
index 6bf37cb..e39a4bd 100644
--- a/README.md
+++ b/README.md
@@ -53,6 +53,7 @@ Gameplay capabilities now include:
 - Character owner selection in edit modal backed by existing-username dropdown data
 - Role-aware authorization with admin role support (including admin user/role management)
 - Campaign deletion by campaign owner or admin (unlinks characters from the campaign and clears campaign log entries)
+- User deletion by admin also deletes campaigns owned by that user and unlinks all characters from those deleted campaigns
 - Campaign management owner labels use account display names (no GUID fallback rendering)
 - Character edit flow supports unlinking from campaigns (owner/GM/admin) and assigning to any existing campaign via expanded campaign options
 - Campaign management supports character deletion by character owner or admin
diff --git a/RpgRoller.Tests/Services/ServiceAdminAndCampaignDeletionTests.cs b/RpgRoller.Tests/Services/ServiceAdminAndCampaignDeletionTests.cs
index 6819531..8ad314d 100644
--- a/RpgRoller.Tests/Services/ServiceAdminAndCampaignDeletionTests.cs
+++ b/RpgRoller.Tests/Services/ServiceAdminAndCampaignDeletionTests.cs
@@ -80,4 +80,53 @@ public sealed class ServiceAdminAndCampaignDeletionTests
         using var db = harness.CreateDbContext();
         Assert.Empty(db.RollLogEntries.Where(entry => entry.CampaignId == adminDeletedCampaign.Id));
     }
+
+    [Fact]
+    public void DeleteUser_DeletesOwnedCampaigns_AndUnlinksCharactersInThoseCampaigns()
+    {
+        using var harness = ServiceTestSupport.CreateHarness(4, 5, 6);
+        var service = harness.Service;
+
+        _ = ServiceTestSupport.GetValue(service.Register("admin", "Password123", "Admin"));
+        _ = ServiceTestSupport.GetValue(service.Register("gm", "Password123", "GM"));
+        _ = ServiceTestSupport.GetValue(service.Register("player", "Password123", "Player"));
+
+        var adminSession = ServiceTestSupport.GetValue(service.Login("admin", "Password123")).SessionToken;
+        var gmSession = ServiceTestSupport.GetValue(service.Login("gm", "Password123")).SessionToken;
+        var playerSession = ServiceTestSupport.GetValue(service.Login("player", "Password123")).SessionToken;
+
+        var gmOwnedCampaign = ServiceTestSupport.GetValue(service.CreateCampaign(gmSession, "GM Campaign", "d6"));
+        var adminOwnedCampaign = ServiceTestSupport.GetValue(service.CreateCampaign(adminSession, "Admin Campaign", "d6"));
+
+        var gmCharacterInOwnedCampaign = ServiceTestSupport.GetValue(service.CreateCharacter(gmSession, "GM Hero", gmOwnedCampaign.Id));
+        var playerCharacterInGmCampaign = ServiceTestSupport.GetValue(service.CreateCharacter(playerSession, "Player Hero", gmOwnedCampaign.Id));
+        var gmCharacterOutsideOwnedCampaign = ServiceTestSupport.GetValue(service.CreateCharacter(gmSession, "Visitor", adminOwnedCampaign.Id));
+
+        var playerSkill = ServiceTestSupport.GetValue(service.CreateSkill(playerSession, playerCharacterInGmCampaign.Id, "Scout", "2D+1", 1, true));
+        _ = ServiceTestSupport.GetValue(service.RollSkill(playerSession, playerSkill.Id, "public"));
+
+        var gmUsers = ServiceTestSupport.GetValue(service.GetUsers(adminSession));
+        var gmUser = gmUsers.Single(user => string.Equals(user.Username, "gm", StringComparison.OrdinalIgnoreCase));
+
+        var deleteResult = ServiceTestSupport.GetValue(service.DeleteUser(adminSession, gmUser.Id));
+        Assert.True(deleteResult);
+
+        Assert.False(service.GetCampaign(adminSession, gmOwnedCampaign.Id).Succeeded);
+
+        var playerCharacters = ServiceTestSupport.GetValue(service.GetOwnCharacters(playerSession));
+        var unlinkedPlayerCharacter = playerCharacters.Single(character => character.Id == playerCharacterInGmCampaign.Id);
+        Assert.Null(unlinkedPlayerCharacter.CampaignId);
+
+        using var db = harness.CreateDbContext();
+        Assert.DoesNotContain(db.Campaigns, campaign => campaign.Id == gmOwnedCampaign.Id);
+        Assert.Empty(db.RollLogEntries.Where(entry => entry.CampaignId == gmOwnedCampaign.Id));
+
+        var preservedGmCharacter = db.Characters.Single(character => character.Id == gmCharacterInOwnedCampaign.Id);
+        Assert.Null(preservedGmCharacter.CampaignId);
+
+        var preservedPlayerCharacter = db.Characters.Single(character => character.Id == playerCharacterInGmCampaign.Id);
+        Assert.Null(preservedPlayerCharacter.CampaignId);
+
+        Assert.DoesNotContain(db.Characters, character => character.Id == gmCharacterOutsideOwnedCampaign.Id);
+    }
 }
diff --git a/RpgRoller/Services/GameService.cs b/RpgRoller/Services/GameService.cs
index fb81387..dc7141f 100644
--- a/RpgRoller/Services/GameService.cs
+++ b/RpgRoller/Services/GameService.cs
@@ -321,10 +321,19 @@ public sealed class GameService : IGameService
                 return ServiceResult<bool>.Failure("user_not_found", "User was not found.");
 
             var gmCampaignIds = m_CampaignsById.Values.Where(campaign => campaign.GmUserId == targetUser.Id).Select(campaign => campaign.Id).ToArray();
+            var gmCampaignIdSet = gmCampaignIds.ToHashSet();
+            var preservedCharacterIds = m_CharactersById.Values
+                .Where(character => character.CampaignId.HasValue && gmCampaignIdSet.Contains(character.CampaignId.Value))
+                .Select(character => character.Id)
+                .ToHashSet();
+
             foreach (var campaignId in gmCampaignIds)
                 DeleteCampaignLocked(campaignId);
 
-            var ownedCharacterIds = m_CharactersById.Values.Where(character => character.OwnerUserId == targetUser.Id).Select(character => character.Id).ToArray();
+            var ownedCharacterIds = m_CharactersById.Values
+                .Where(character => character.OwnerUserId == targetUser.Id && !preservedCharacterIds.Contains(character.Id))
+                .Select(character => character.Id)
+                .ToArray();
             foreach (var characterId in ownedCharacterIds)
                 DeleteCharacterLocked(characterId);