Publishers
- The William Herschel Society 1
- The Wincanton Press 1
- The Windermere Nautical Trust 1
- The Wordsworth Trust 1
- The World Publishing Company 3
- The Worshipful Company Of Grocers 1
- The Worshipful Livery Company Of Wales 1
- The Yorkshire Post 1
- Theophrastus 1
- Thieme 1
- Thirtynineassociates 1
- Thomas Beecham 1
- Thomas Boys 1
- Thomas C. Lothian Pty. Ltd 1
- Thomas Cautley Newby 1
- Thomas De La Rue & Co. Ltd. 2
- Thomas Kelly 3
- Thomas Murray And Son 1
- Thomas Nelson 1
- Thomas Nelson & Sons 61
- Thomas Nelson and Sons Ltd. 143
- Thomas Reed & Co. Ltd. 1
- Thomas Tegg 3
- Thomas Tegg & Son 1
- Thomas Whittaker 1
- Thomas Y. Crowell 2
- Thomas Y. Crowell Co. 3
- Thomas Yoseloff 1
- Thomas-Photos 1
- Thomas's Publications Ltd. 1
- Thomasson-Grant 1
- Thomson Press 1
- Thornhill Press 9
- Thornton Butterworth 1
- Thorsons 1
- Thos. Agnew & Sons 1
- Thos. Cook and Son 1
- 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
- Tiger Books 2
- Tiger Books International 2
- Timber Press 4
- Timberholme Books 1
- Times Books 6
- Tinder Press 1
- Tinsley Brothers 2
- Titan Books 1
- Titan Comics 1
- Titan Publications (pty) Ltd. 1
- Titus Wilson & Son 1
- Titus Wilson & Son, Ltd. 1
- Tlc Publishing Inc. 4
- Toby Twirl Ltd. 2
- Todtri 2
- Tom Dickins Fine Art 4
- Tom Donovan 2
- Tom Purves 1
- Tomahawk Films 1
- Top Sellers Ltd. 3
- Topsy Ii Publishing 1
- Tor Mark Press 2
- Toronto Public Library 3
- Total Detail Publications Ltd 1
- Touchstone Books 1
- Tourrett Publishing 2
- Towarzystwo Akcyjne 1
- Tower Press 1
- Town & Country Press 1
- Town County Books 1
- Town House 1
- Town House & Country House 1
- Trackmaps 1
- Trackside Publications 1
- Trade & Travel Publications 1
- Tramroad House 1
- Transatlantic Arts Ltd. 5
- Transport Bookman Publications 7
- Transport Treasury Publishing Ltd 2
- Transpress 1
- Transworld Publishers Ltd. 1
- Traplet Publications 1
- Travel Publishing 1
- Treasure Library 1
- Tredegar Historical Society 1
- Trefoil Books 1
- Trefoil Publications 1
- Trent Valley Publications 1
- Treowen Press 1
- Trevor A. Bevis 1
- Trevor Bevis 1
- Tribune 1
- Trident Press 1