diff --git a/search_gui.py b/search_gui.py
index def7832..aba1ef2 100644
--- a/search_gui.py
+++ b/search_gui.py
@@ -35,6 +35,10 @@ class SearchGUI:
         self.search_stats = search_stats
         self.gui_core = gui_core
         self.verbose = verbose
+        
+        # Sorting state
+        self.sort_column = None
+        self.sort_reverse = False
 
     def search_gui(self) -> int:
         """Open the Search GUI window."""
@@ -77,10 +81,10 @@ class SearchGUI:
 
         columns = ("person", "open_dir", "open_photo", "path")
         tree = ttk.Treeview(results_frame, columns=columns, show="headings", selectmode="browse")
-        tree.heading("person", text="Person")
+        tree.heading("person", text="Person", command=lambda: sort_treeview("person"))
         tree.heading("open_dir", text="📁")
         tree.heading("open_photo", text="📷")
-        tree.heading("path", text="Photo path")
+        tree.heading("path", text="Photo path", command=lambda: sort_treeview("path"))
         tree.column("person", width=220, anchor="w")
         tree.column("open_dir", width=50, anchor="center")
         tree.column("open_photo", width=50, anchor="center")
@@ -97,6 +101,52 @@ class SearchGUI:
         close_btn = ttk.Button(btns, text="Close", command=lambda: root.destroy())
         close_btn.pack(side=tk.RIGHT)
 
+        # Sorting functionality
+        def sort_treeview(col: str):
+            """Sort the treeview by the specified column."""
+            # Get all items and their values
+            items = [(tree.set(child, col), child) for child in tree.get_children('')]
+            
+            # Determine sort direction
+            if self.sort_column == col:
+                # Same column clicked - toggle direction
+                self.sort_reverse = not self.sort_reverse
+            else:
+                # Different column clicked - start with ascending
+                self.sort_reverse = False
+                self.sort_column = col
+            
+            # Sort the items
+            # For person and path columns, sort alphabetically
+            # For icon columns, maintain original order
+            if col in ['person', 'path']:
+                items.sort(key=lambda x: x[0].lower(), reverse=self.sort_reverse)
+            else:
+                # For icon columns, just reverse if clicking same column
+                if self.sort_column == col and self.sort_reverse:
+                    items.reverse()
+            
+            # Reorder items in treeview
+            for index, (val, child) in enumerate(items):
+                tree.move(child, '', index)
+            
+            # Update header display
+            update_header_display()
+        
+        def update_header_display():
+            """Update header display to show sort indicators."""
+            # Reset all headers
+            tree.heading("person", text="Person")
+            tree.heading("path", text="Photo path")
+            
+            # Add sort indicator to current sort column
+            if self.sort_column == "person":
+                indicator = " ↓" if self.sort_reverse else " ↑"
+                tree.heading("person", text="Person" + indicator)
+            elif self.sort_column == "path":
+                indicator = " ↓" if self.sort_reverse else " ↑"
+                tree.heading("path", text="Photo path" + indicator)
+
         # Behavior
         def switch_inputs(*_):
             for w in inputs.winfo_children():
@@ -114,11 +164,29 @@ class SearchGUI:
         def clear_results():
             for i in tree.get_children():
                 tree.delete(i)
+            # Reset sorting state for new search
+            self.sort_column = None
+            self.sort_reverse = False
+            update_header_display()
 
         def add_results(rows: List[tuple]):
             # rows expected: List[(full_name, path)]
             for full_name, p in rows:
                 tree.insert("", tk.END, values=(full_name, "📁", "📷", p))
+            
+            # Sort by person name by default when results are first loaded
+            if rows and self.sort_column is None:
+                # Force ascending sort on first load
+                self.sort_column = "person"
+                self.sort_reverse = False
+                # Get all items and sort them directly
+                items = [(tree.set(child, "person"), child) for child in tree.get_children('')]
+                items.sort(key=lambda x: x[0].lower(), reverse=False)  # Ascending
+                # Reorder items in treeview
+                for index, (val, child) in enumerate(items):
+                    tree.move(child, '', index)
+                # Update header display
+                update_header_display()
 
         def do_search():
             clear_results()