Publishers
- T. & A. Constable 1
- T. & A.D. Poyser 37
- T. & J. Manson 1
- T. Allman 1
- T. Buncle & Co. 1
- T. Buncle & Co. Ltd. 1
- T. Cadell 2
- T. Cadell and W. Davies 3
- T. Carnan 1
- T. Egerton 2
- T. Fisher Unwin 13
- T. Fisher Unwin Ltd. 1
- T. Gee 1
- T. Maskew Miller 1
- T. N. Foulis 1
- T. Nelson & Sons 27
- T. Nelson & Sons Ltd. 3
- T. Richards 1
- T. Tegg 1
- T. Waller 1
- T. Werner Laurie Ltd. 5
- T.C. & E.C. Jack 13
- T.C. & E.C. Jack Ltd. 15
- T.E. Schuster 2
- T.F.H. Kingdom 2
- T.F.H. Publications Ltd. 1
- T.F.H. Publications, Inc 2
- T.F.H. Publications, Inc. Ltd. 1
- T.J. Allman 1
- T.L. Ainsley 1
- T.M.R.S. 1
- T.N. Foulis 4
- T.V. Boardman & Co. Ltd. 1
- T.V. Boardman & Company Limited 3
- T.Y. Crowell & Co. 1
- TAB Books 1
- Tabb House 1
- Tally-Ho Books 1
- Tamara Publications 1
- Tamarind Ltd. 1
- Tango Books 15
- Tank Archives Press 1
- TANNERS YARD PRESS 1
- Taplinger Publishing Co., Inc. 1
- Tarquin 1
- Taschen 5
- Tate Gallery 3
- Tate Publishing 1
- Tauris Academic Studies 2
- Taurus Press 1
- Tavistock Publications 1
- Taylor & Francis 3
- Taylor Publishing Company 1
- Teamband Ltd. 1
- Ted Smart 15
- Tegg, Wise & Tegg 1
- Tempest Associates Limited 1
- Templar Publishing 6
- Temple Lodge Publishing 1
- Temple Nostalgia 1
- Temple Press 7
- Temple Press Limited 8
- Temple Smith 1
- Temple University Press 1
- Tempus 47
- Tempus Publishing Ltd 22
- Tempus Reparatum 1
- Tenby Museum 1
- Tennessee University Press 1
- Tentmaker Publications 1
- Teredo Books 2
- Terence Dalton Limited 5
- Tern Press 1
- Terry Underwood 4
- Teton Newmedia 1
- Th. Shroter 1
- Thames and Hudson 33
- Thames Publishing Co. 2
- The 8th Af News 1
- The 8th Air Force Memorial Museum Foundation 1
- The Ace Publishing Company 9
- The Actinic Press 1
- The Adventurers Club 1
- The Advertiser Press Ltd. 1
- The Aeroplane And General Publishing Co. Limited 1
- The Afan Valley Angling Club 1
- The Agricultural Research Corporation 1
- The Air League Of The British Empire 6
- The Albert F. Simpson Historical Research Centre 1
- The Albion Press 1
- The Alderman Press 1
- The Alexandra Publishing Co. 3
- The Alpine Club 1
- The Alvis Register 1
- The Amaising Publishing House Ltd. 1
- The Amalgamated Press 53
- The Amalgamated Press Limited 9
- The American Federation of Arts 1
- The American Ornithologists Union 2
- The American Philosophical Society 1