Publishers
- The Syndicate Publishing Co. 1
- The T.T. Special 1
- The Talyllyn Railway Preservation Society 1
- The Technical Publishing Co. Ltd. 1
- The Temple Press 3
- The Thames Publishing Co. 2
- The Tothill Press 13
- The Trade Papers Publishing Co. Ltd. 1
- The Transport Publishing Company 5
- The Travel Press & Publicity Co. 1
- The Tree Council 1
- The Trendine Press 1
- The Tryon Gallery 1
- The Tuttle, Morehouse & Taylor Company 1
- The Twentieth Century Society 1
- The University Of Arkansas Press 2
- The University of Georgia Press 2
- The University Press 1
- The University Press, Glasgow 2
- The Vendome Press 1
- The Viking Press 3
- The Violet Needham Society 2
- The War Office 1
- The Waterways Museum 2
- The Wellesbourne Village Society 1
- The Wellfleet Press 2
- The Welsh Outlook Press 2
- The West Wales Naturalists' Trust 1
- The Whitefriar's Press Ltd. 1
- The Wiggins Teape Group 1
- The William Herschel Society 1
- The Windermere Nautical Trust 1
- The Window Press 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 52
- Thomas Nelson and Sons Ltd. 133
- Thomas Nelson Inc. 1
- Thomas Reed & Co. Ltd. 1
- Thomas Richardson And Son 1
- Thomas Tegg 3
- Thomas Tegg & Son 1
- Thomas Telford 1
- Thomas Whittaker 1
- Thomas Y. Crowell 2
- Thomas Y. Crowell Co. 2
- Thomas Yoseloff 1
- Thomas-Photos 1
- Thomas's Publications Ltd. 1
- Thomasson-Grant 1
- Thomson Press 1
- Thornhill Press 10
- 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
- Thunder Bay Press 2
- Thurman Publishing 2
- Ticknor & Fields 1
- Ticknor, Reed, And Fields 1
- Tidewater Publishers 1
- Tiger Books International 2
- Timber Press 4
- Timberholme Books 1
- Times Books 5
- Tinsley Brothers 2
- Titan Books 1
- Titan Comics 1
- Titus Wilson & Son, Ltd. 1
- Tlc Publishing Inc. 3
- Toby Twirl Ltd. 2
- Todtri 2
- Tom C. Saville Ltd. 1
- Tom Dickins Fine Art 4
- Tom Donovan 1
- Tom Purves 1
- Tomahawk Films 1
- Tomorrow River Press 1
- Top Sellers Ltd. 3
- Tor Mark Press 2
- Toronto Public Library 3