diff --git a/src/lib/components/party/Party.svelte b/src/lib/components/party/Party.svelte
index 8c8a4ca1..58851e11 100644
--- a/src/lib/components/party/Party.svelte
+++ b/src/lib/components/party/Party.svelte
@@ -316,6 +316,14 @@
 	// Check if syncing is in progress
 	const isSyncingAll = $derived(syncAllItems.isPending)
 
+	// Check if any items in the party are orphaned (linked collection item was deleted)
+	const hasOrphanedItems = $derived.by(() => {
+		const hasOrphanedWeapons = (party?.weapons ?? []).some((w) => w?.orphaned)
+		const hasOrphanedCharacters = (party?.characters ?? []).some((c) => c?.orphaned)
+		const hasOrphanedSummons = (party?.summons ?? []).some((s) => s?.orphaned)
+		return hasOrphanedWeapons || hasOrphanedCharacters || hasOrphanedSummons
+	})
+
 	function handleTabChange(tab: GridType) {
 		activeTab = tab // Instant UI update
 
@@ -941,6 +949,13 @@
 				{/snippet}
 			</PartyInfoGrid>
 
+			{#if hasOrphanedItems}
+				<div class="orphan-warning" role="alert">
+					<Icon name="alertTriangle" size={16} />
+					<span>Some items in this party are no longer in your collection and may have outdated data.</span>
+				</div>
+			{/if}
+
 			<PartySegmentedControl
 				selectedTab={activeTab}
 				onTabChange={handleTabChange}
@@ -1149,4 +1164,21 @@
 			background: color.adjust($error, $lightness: -10%);
 		}
 	}
+
+	.orphan-warning {
+		display: flex;
+		align-items: center;
+		gap: $unit;
+		padding: $unit $unit-2x;
+		background: rgba(209, 137, 58, 0.15);
+		border: 1px solid rgba(209, 137, 58, 0.4);
+		border-radius: $unit-half;
+		color: #c47a1a;
+		font-size: $font-small;
+
+		:global(svg) {
+			flex-shrink: 0;
+			color: #c47a1a;
+		}
+	}
 </style>
diff --git a/src/lib/components/units/CharacterUnit.svelte b/src/lib/components/units/CharacterUnit.svelte
index 3f8b0f6c..c74b48fc 100644
--- a/src/lib/components/units/CharacterUnit.svelte
+++ b/src/lib/components/units/CharacterUnit.svelte
@@ -176,7 +176,7 @@
 	}
 </script>
 
-<div class="unit {elementClass}" class:empty={!item} class:is-active={isActive}>
+<div class="unit {elementClass}" class:empty={!item} class:is-active={isActive} class:orphaned={item?.orphaned}>
 	{#if item}
 		<UnitMenuContainer showGearButton={true}>
 			{#snippet trigger()}
@@ -218,6 +218,11 @@
 									title="Perpetuity Ring"
 								/>
 							{/if}
+							{#if item?.orphaned}
+								<div class="orphaned-badge" title="This item is no longer in your collection">
+									<Icon name="alertTriangle" size={16} />
+								</div>
+							{/if}
 							{#if imageUrl}
 								<img
 									class="image {elementClass}"
@@ -617,4 +622,34 @@
 			color: colors.$grey-40;
 		}
 	}
+
+	.orphaned-badge {
+		position: absolute;
+		top: 4px;
+		right: 4px;
+		width: 24px;
+		height: 24px;
+		background: #d13a3a;
+		border-radius: 50%;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		color: white;
+		z-index: 10;
+		pointer-events: auto;
+		cursor: help;
+		box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
+	}
+
+	// Orphaned state
+	.unit.orphaned {
+		.frame {
+			opacity: 0.7;
+			border: 2px solid #d13a3a;
+		}
+
+		.name {
+			color: #d13a3a;
+		}
+	}
 </style>
diff --git a/src/lib/components/units/SummonUnit.svelte b/src/lib/components/units/SummonUnit.svelte
index 037034b6..377019a8 100644
--- a/src/lib/components/units/SummonUnit.svelte
+++ b/src/lib/components/units/SummonUnit.svelte
@@ -114,7 +114,7 @@
 
 </script>
 
-<div class="unit {elementClass}" class:empty={!item} class:is-active={isActive}>
+<div class="unit {elementClass}" class:empty={!item} class:is-active={isActive} class:orphaned={item?.orphaned}>
   {#if item}
     <UnitMenuContainer showGearButton={true}>
       {#snippet trigger()}
@@ -129,6 +129,11 @@
               class:is-active={isActive}
               onclick={() => viewDetails()}
             >
+            {#if item?.orphaned}
+              <div class="orphaned-badge" title="This item is no longer in your collection">
+                <Icon name="alertTriangle" size={16} />
+              </div>
+            {/if}
             <img
               class="image {elementClass}"
               class:placeholder={!item?.summon?.granblueId}
@@ -346,6 +351,36 @@
     color: var(--text-secondary);
   }
 
+  .orphaned-badge {
+    position: absolute;
+    top: 4px;
+    right: 4px;
+    width: 24px;
+    height: 24px;
+    background: #d13a3a;
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: white;
+    z-index: 10;
+    pointer-events: auto;
+    cursor: help;
+    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
+  }
+
+  // Orphaned state
+  .unit.orphaned {
+    .frame {
+      opacity: 0.7;
+      border: 2px solid #d13a3a;
+    }
+
+    .name {
+      color: #d13a3a;
+    }
+  }
+
   // Pulsing focus ring animation
   @keyframes pulse-focus-ring {
     0%, 100% {
diff --git a/src/lib/components/units/WeaponUnit.svelte b/src/lib/components/units/WeaponUnit.svelte
index 49aa4945..ce0d1a43 100644
--- a/src/lib/components/units/WeaponUnit.svelte
+++ b/src/lib/components/units/WeaponUnit.svelte
@@ -152,6 +152,7 @@
 	class:empty={!item}
 	class:extra={position >= 9}
 	class:is-active={isActive}
+	class:orphaned={item?.orphaned}
 >
 	{#if item}
 		<UnitMenuContainer showGearButton={true}>
@@ -173,6 +174,11 @@
 							onclick={() => viewDetails()}
 						>
 							<div class="modifiers">
+								{#if item?.orphaned}
+									<div class="orphaned-badge" title="This item is no longer in your collection">
+										<Icon name="alertTriangle" size={16} />
+									</div>
+								{/if}
 								{#if awakeningImage}
 									<img
 										class="awakening"
@@ -448,6 +454,24 @@
 		z-index: 3;
 		pointer-events: none;
 
+		.orphaned-badge {
+			position: absolute;
+			top: 4px;
+			right: 4px;
+			width: 24px;
+			height: 24px;
+			background: #d13a3a;
+			border-radius: 50%;
+			display: flex;
+			align-items: center;
+			justify-content: center;
+			color: white;
+			z-index: 10;
+			pointer-events: auto;
+			cursor: help;
+			box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
+		}
+
 		.awakening {
 			position: absolute;
 			width: 30%;
@@ -467,6 +491,18 @@
 		}
 	}
 
+	// Orphaned state
+	.unit.orphaned {
+		.frame {
+			opacity: 0.7;
+			border: 2px solid #d13a3a;
+		}
+
+		.name {
+			color: #d13a3a;
+		}
+	}
+
 	// Position modifiers for grid weapons
 	.frame.weapon.cell {
 		.awakening {
diff --git a/src/lib/types/api/party.ts b/src/lib/types/api/party.ts
index b66d34ae..dbfa54b9 100644
--- a/src/lib/types/api/party.ts
+++ b/src/lib/types/api/party.ts
@@ -38,6 +38,8 @@ export interface GridWeapon {
   collectionWeaponId?: string
   /** Whether the grid item is out of sync with its collection source */
   outOfSync?: boolean
+  /** Whether the linked collection item has been deleted (item is orphaned) */
+  orphaned?: boolean
 }
 
 // GridCharacter from GridCharacterBlueprint
@@ -60,6 +62,8 @@ export interface GridCharacter {
   collectionCharacterId?: string
   /** Whether the grid item is out of sync with its collection source */
   outOfSync?: boolean
+  /** Whether the linked collection item has been deleted (item is orphaned) */
+  orphaned?: boolean
 }
 
 // GridSummon from GridSummonBlueprint
@@ -76,6 +80,8 @@ export interface GridSummon {
   collectionSummonId?: string
   /** Whether the grid item is out of sync with its collection source */
   outOfSync?: boolean
+  /** Whether the linked collection item has been deleted (item is orphaned) */
+  orphaned?: boolean
 }
 
 // JobSkillList for party job skills
@@ -115,6 +121,8 @@ export interface Party {
   extra?: boolean
   remix?: boolean
   editKey?: string
+  /** Whether the party contains any orphaned grid items */
+  hasOrphanedItems?: boolean
 
   // Relationships
   weapons: GridWeapon[]