Publishers
- Thos. Holdsworth & Sons, Ltd. 1
- Thos. McLean 1
- Thos. Wall & Sons Ltd. 6
- Three Essays Collective 1
- Three Imposters 1
- Threshold Books 1
- Thunder Bay Press 3
- Thurman Publishing 3
- Ticknor & Fields 1
- Tidewater Publishers 1
- Tiercel Publishing 1
- Tiger Books 2
- Tiger Books International 2
- Timber Press 5
- Timberholme Books 1
- Times Books 6
- Tinsley Brothers 2
- Titan Books 1
- Titan Comics 1
- Titus Wilson & Son 1
- Titus Wilson & Son, Ltd. 1
- Tlc Publishing Inc. 5
- Toby Twirl Ltd. 3
- Todtri 1
- Tom Dickins Fine Art 4
- Tom Donovan 2
- Tom Purves 1
- Tomahawk Films 1
- Top Sellers Ltd. 3
- Tor Mark Press 2
- Toronto Public Library 3
- Total Detail Publications Ltd 1
- Touchstone Books 2
- Tourrett Publishing 2
- Towarzystwo Akcyjne 1
- Tower Press 1
- Town & Country Press 1
- Town County Books 2
- Town House 1
- Town House & Country House 1
- Trackmaps 1
- Trackside Publications 1
- Trade & Travel Publications 1
- Trafford Publishing 1
- Train Crazy Publishing 1
- Tramroad House 1
- Transatlantic Arts Ltd. 4
- Transport Bookman Publications 7
- Transport Treasury Publishing Ltd 3
- Transpress 1
- Transworld Publishers Ltd. 3
- Traplet Publications 2
- Travel Publishing 1
- Treasure Library 1
- Tredegar Historical Society 1
- Trefoil Books 1
- Trefoil Publications 1
- Trent Valley Publications 1
- Treowen Press 2
- Trevor A. Bevis 1
- Trevor Bevis 1
- Trevor S. Jennings 1
- Triangle Publishing 1
- Tribune 1
- Trident Press 1
- Trinity University Press 1
- Trois Conils 1
- Trondheim 1
- Trubner & Co. 1
- True North 3
- Tucann 1
- Tudor Journals 1
- Tudor Printing Works 1
- Tuffy Books 1
- Tunbridge Wells High School 1
- Turbo Machinery 1
- Turner Publishing, Inc. 1
- Turntable Enterprises 1
- Turntable Publications 3
- Turret Books 1
- Turton & Armstrong 2
- Turton & Chambers 1
- Tuttle Publishing 1
- Tweenbrook Publishing 1
- Two Crows Books 1
- Two Hoots 3
- Two Lions 1
- Tyndall 1
- Tyne And Wear County Council 1
- Tyne Bridge Publishing 1
- Tynron Press 1