diff --git a/CHANGELOG.md b/CHANGELOG.md
index b921c7a..6ad1008 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 All notable changes to Library Manager will be documented in this file.
 
+## [0.9.0-beta.122] - 2026-02-11
+
+### Added
+
+- **Issue #111: Sortable columns** - Library table columns (Author, Title, Status) can now be
+  sorted by clicking column headers. Click once for ascending, again for descending, third click
+  clears sort back to default order. Visual arrow indicators show active sort column and direction.
+  Sort state preserved during pagination and filter changes. Backend validates sort columns against
+  a whitelist to prevent SQL injection.
+
+---
+
 ## [0.9.0-beta.121] - 2026-02-10
 
 ### Fixed
diff --git a/app.py b/app.py
index 289577d..d31e6f0 100644
--- a/app.py
+++ b/app.py
@@ -11,7 +11,7 @@
 - Multi-provider AI (Gemini, OpenRouter, Ollama)
 """
 
-APP_VERSION = "0.9.0-beta.121"
+APP_VERSION = "0.9.0-beta.122"
 GITHUB_REPO = "deucebucket/library-manager"  # Your GitHub repo
 
 # Versioning Guide:
@@ -8954,6 +8954,24 @@ def api_library():
     per_page = request.args.get('per_page', 50, type=int)
     offset = (page - 1) * per_page
 
+    # Issue #111: Sortable columns
+    sort_by = request.args.get('sort', '')[:20]
+    sort_dir = request.args.get('sort_dir', 'asc')
+    if sort_dir not in ('asc', 'desc'):
+        sort_dir = 'asc'
+    sort_direction = 'ASC' if sort_dir == 'asc' else 'DESC'
+
+    # Whitelist of sortable columns per table context
+    BOOK_SORT_COLS = {'author': 'current_author', 'title': 'current_title', 'status': 'status'}
+    HISTORY_SORT_COLS = {'author': 'h.old_author', 'title': 'h.old_title', 'status': 'h.status', 'date': 'h.fixed_at'}
+    QUEUE_SORT_COLS = {'author': 'b.current_author', 'title': 'b.current_title', 'priority': 'q.priority'}
+
+    def build_order_by(sort_cols, default_order):
+        """Build ORDER BY clause from whitelisted sort columns or default."""
+        if sort_by and sort_by in sort_cols:
+            return 'ORDER BY ' + sort_cols[sort_by] + ' ' + sort_direction
+        return 'ORDER BY ' + default_order
+
     items = []
 
     # Get search parameter
@@ -9042,6 +9060,11 @@ def api_library():
 
     # === FETCH ITEMS based on filter ===
     if status_filter == 'orphan':
+        # Issue #111: Sort orphans if requested
+        if sort_by == 'author':
+            orphan_list.sort(key=lambda o: (o.get('author') or '').lower(), reverse=(sort_dir == 'desc'))
+        elif sort_by == 'title':
+            orphan_list.sort(key=lambda o: (o.get('detected_title') or '').lower(), reverse=(sort_dir == 'desc'))
         # Return orphans as items
         for idx, orphan in enumerate(orphan_list[offset:offset + per_page]):
             items.append({
@@ -9058,13 +9081,14 @@ def api_library():
 
     elif status_filter == 'pending':
         # Items with pending fixes
+        order = build_order_by(HISTORY_SORT_COLS, 'h.fixed_at DESC')
         c.execute('''SELECT h.id, h.book_id, h.old_author, h.old_title, h.new_author, h.new_title,
                             h.old_path, h.new_path, h.status, h.fixed_at, h.error_message,
                             b.path, b.current_author, b.current_title
                      FROM history h
                      JOIN books b ON h.book_id = b.id
                      WHERE h.status = 'pending_fix'
-                     ORDER BY h.fixed_at DESC
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9085,12 +9109,13 @@ def api_library():
     elif status_filter == 'queue':
         # Items in the processing queue
         # Issue #36: Filter out series_folder and multi_book_files - they should never appear in queue
+        order = build_order_by(QUEUE_SORT_COLS, 'q.priority, q.added_at')
         c.execute('''SELECT q.id as queue_id, q.reason, q.added_at, q.priority,
                             b.id as book_id, b.path, b.current_author, b.current_title, b.status
                      FROM queue q
                      JOIN books b ON q.book_id = b.id
                      WHERE b.status NOT IN ('series_folder', 'multi_book_files', 'verified', 'fixed')
-                     ORDER BY q.priority, q.added_at
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9108,13 +9133,14 @@ def api_library():
 
     elif status_filter == 'fixed':
         # Successfully fixed items
+        order = build_order_by(HISTORY_SORT_COLS, 'h.fixed_at DESC')
         c.execute('''SELECT h.id, h.book_id, h.old_author, h.old_title, h.new_author, h.new_title,
                             h.old_path, h.new_path, h.status, h.fixed_at,
                             b.path
                      FROM history h
                      JOIN books b ON h.book_id = b.id
                      WHERE h.status = 'fixed'
-                     ORDER BY h.fixed_at DESC
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9134,10 +9160,11 @@ def api_library():
 
     elif status_filter == 'verified':
         # Verified/OK books - include profile for source display
+        order = build_order_by(BOOK_SORT_COLS, 'updated_at DESC')
         c.execute('''SELECT id, path, current_author, current_title, status, updated_at, profile, confidence, user_locked
                      FROM books
                      WHERE status = 'verified'
-                     ORDER BY updated_at DESC
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             item = {
@@ -9168,13 +9195,14 @@ def api_library():
 
     elif status_filter == 'error':
         # Error items from history
+        order = build_order_by(HISTORY_SORT_COLS, 'h.fixed_at DESC')
         c.execute('''SELECT h.id, h.book_id, h.old_author, h.old_title, h.new_author, h.new_title,
                             h.old_path, h.new_path, h.status, h.fixed_at, h.error_message,
                             b.path
                      FROM history h
                      JOIN books b ON h.book_id = b.id
                      WHERE h.status IN ('error', 'duplicate', 'corrupt_dest')
-                     ORDER BY h.fixed_at DESC
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9195,13 +9223,14 @@ def api_library():
 
     elif status_filter == 'attention':
         # Items needing attention
+        order = build_order_by(HISTORY_SORT_COLS, 'h.fixed_at DESC')
         c.execute('''SELECT h.id, h.book_id, h.old_author, h.old_title, h.new_author, h.new_title,
                             h.old_path, h.new_path, h.status, h.fixed_at, h.error_message,
                             b.path
                      FROM history h
                      JOIN books b ON h.book_id = b.id
                      WHERE h.status = 'needs_attention'
-                     ORDER BY h.fixed_at DESC
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9217,9 +9246,11 @@ def api_library():
                 'error_message': row['error_message']
             })
         # Also get books with structure issues or watch folder errors
+        order2 = build_order_by(BOOK_SORT_COLS, 'current_author, current_title')
         c.execute('''SELECT id, path, current_author, current_title, status, error_message, source_type
                      FROM books
                      WHERE status IN ('needs_attention', 'structure_reversed', 'watch_folder_error')
+                     ''' + order2 + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9236,10 +9267,11 @@ def api_library():
 
     elif status_filter == 'locked':
         # User-locked books - books where user has manually set metadata
+        order = build_order_by(BOOK_SORT_COLS, 'updated_at DESC')
         c.execute('''SELECT id, path, current_author, current_title, status, updated_at, user_locked
                      FROM books
                      WHERE user_locked = 1
-                     ORDER BY updated_at DESC
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9255,10 +9287,11 @@ def api_library():
 
     # Issue #53: Media type filters
     elif status_filter == 'audiobook_only':
+        order = build_order_by(BOOK_SORT_COLS, 'current_author, current_title')
         c.execute('''SELECT id, path, current_author, current_title, status, updated_at, user_locked, media_type
                      FROM books
                      WHERE media_type = 'audiobook' OR media_type IS NULL
-                     ORDER BY current_author, current_title
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9274,10 +9307,11 @@ def api_library():
             })
 
     elif status_filter == 'ebook_only':
+        order = build_order_by(BOOK_SORT_COLS, 'current_author, current_title')
         c.execute('''SELECT id, path, current_author, current_title, status, updated_at, user_locked, media_type
                      FROM books
                      WHERE media_type = 'ebook'
-                     ORDER BY current_author, current_title
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9293,10 +9327,11 @@ def api_library():
             })
 
     elif status_filter == 'both_formats':
+        order = build_order_by(BOOK_SORT_COLS, 'current_author, current_title')
         c.execute('''SELECT id, path, current_author, current_title, status, updated_at, user_locked, media_type
                      FROM books
                      WHERE media_type = 'both'
-                     ORDER BY current_author, current_title
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9314,10 +9349,11 @@ def api_library():
     elif status_filter == 'search' and search_query:
         # Search across all books by author or title
         search_pattern = f'%{search_query}%'
+        order = build_order_by(BOOK_SORT_COLS, 'current_author, current_title')
         c.execute('''SELECT id, path, current_author, current_title, status, updated_at, user_locked, media_type
                      FROM books
                      WHERE current_author LIKE ? OR current_title LIKE ?
-                     ORDER BY current_author, current_title
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (search_pattern, search_pattern, per_page, offset))
         for row in c.fetchall():
             items.append({
@@ -9339,12 +9375,13 @@ def api_library():
 
     else:  # 'all' - show everything mixed
         # Get recent history items (includes pending, fixed, errors)
+        order = build_order_by(HISTORY_SORT_COLS, 'h.fixed_at DESC')
         c.execute('''SELECT h.id, h.book_id, h.old_author, h.old_title, h.new_author, h.new_title,
                             h.old_path, h.new_path, h.status, h.fixed_at, h.error_message,
                             b.path, b.current_author, b.current_title, b.user_locked
                      FROM history h
                      JOIN books b ON h.book_id = b.id
-                     ORDER BY h.fixed_at DESC
+                     ''' + order + '''
                      LIMIT ? OFFSET ?''', (per_page, offset))
         for row in c.fetchall():
             item_type = 'pending_fix' if row['status'] == 'pending_fix' else \
@@ -9412,6 +9449,8 @@ def api_library():
         'per_page': per_page,
         'total': total,
         'total_pages': total_pages,
+        'sort': sort_by,
+        'sort_dir': sort_dir,
         'skip_confirmations': config.get('skip_confirmations', False)
     })
 
diff --git a/templates/library.html b/templates/library.html
index 8bcafd9..120bc24 100644
--- a/templates/library.html
+++ b/templates/library.html
@@ -73,6 +73,18 @@
         padding: 2px 8px;
         font-size: 0.8rem;
     }
+    /* Issue #111: Sortable column headers */
+    th[onclick]:hover {
+        color: #00d9ff;
+    }
+    .sort-icon {
+        font-size: 0.7rem;
+        opacity: 0.5;
+    }
+    .sort-icon.active {
+        opacity: 1;
+        color: #00d9ff;
+    }
 </style>
 
 <!-- Filter Chips -->
@@ -206,9 +218,15 @@
             <thead style="position: sticky; top: 0; background: rgba(22, 33, 62, 0.98); z-index: 10;">
                 <tr>
                     <th style="width: 3%;"><input type="checkbox" id="select-all" onclick="toggleSelectAll()" title="Select all visible"></th>
-                    <th style="width: 23%;">Author</th>
-                    <th style="width: 29%;">Title</th>
-                    <th style="width: 14%;">Status</th>
+                    <th style="width: 23%; cursor: pointer; user-select: none;" onclick="toggleSort('author')" title="Sort by author">
+                        Author <span class="sort-icon" id="sort-icon-author"></span>
+                    </th>
+                    <th style="width: 29%; cursor: pointer; user-select: none;" onclick="toggleSort('title')" title="Sort by title">
+                        Title <span class="sort-icon" id="sort-icon-title"></span>
+                    </th>
+                    <th style="width: 14%; cursor: pointer; user-select: none;" onclick="toggleSort('status')" title="Sort by status">
+                        Status <span class="sort-icon" id="sort-icon-status"></span>
+                    </th>
                     <th style="width: 18%;">Details</th>
                     <th style="width: 13%;">Actions</th>
                 </tr>
@@ -348,6 +366,8 @@ <h5 class="modal-title"><i class="bi bi-pencil"></i> Edit Book Metadata</h5>
 <script>
 let currentFilter = 'all';
 let currentPage = 1;
+let currentSort = '';
+let currentSortDir = 'asc';
 let libraryData = null;
 let skipConfirmations = {{ 'true' if config.get('skip_confirmations') else 'false' }};
 let isProcessing = false;
@@ -381,6 +401,38 @@ <h5 class="modal-title"><i class="bi bi-pencil"></i> Edit Book Metadata</h5>
 
 let currentSearch = '';
 
+// Issue #111: Sort column toggle
+function toggleSort(column) {
+    if (currentSort === column) {
+        // Same column: toggle direction, or clear on third click
+        if (currentSortDir === 'asc') {
+            currentSortDir = 'desc';
+        } else {
+            currentSort = '';
+            currentSortDir = 'asc';
+        }
+    } else {
+        currentSort = column;
+        currentSortDir = 'asc';
+    }
+    currentPage = 1;
+    loadLibrary();
+}
+
+function updateSortIcons() {
+    document.querySelectorAll('.sort-icon').forEach(icon => {
+        icon.textContent = '';
+        icon.classList.remove('active');
+    });
+    if (currentSort) {
+        const icon = document.getElementById(`sort-icon-${currentSort}`);
+        if (icon) {
+            icon.textContent = currentSortDir === 'asc' ? '\u25B2' : '\u25BC';
+            icon.classList.add('active');
+        }
+    }
+}
+
 function loadLibrary() {
     const tbody = document.getElementById('items-table');
     tbody.innerHTML = `
@@ -396,13 +448,19 @@ <h5 class="modal-title"><i class="bi bi-pencil"></i> Edit Book Metadata</h5>
     if (currentSearch) {
         url += `&search=${encodeURIComponent(currentSearch)}`;
     }
+    if (currentSort) {
+        url += `&sort=${currentSort}&sort_dir=${currentSortDir}`;
+    }
     fetch(url)
         .then(r => r.json())
         .then(data => {
             libraryData = data;
+            currentSort = data.sort || '';
+            currentSortDir = data.sort_dir || 'asc';
             updateCounts(data.counts);
             renderItems(data.items);
             renderPagination(data.page, data.total_pages);
+            updateSortIcons();
 
             // Show/hide contextual buttons (with null checks for robustness)
             const btnApplyAll = document.getElementById('btn-apply-all');