Former Owner
- T. Royer1
- T. Whitcombe Greene1
- Theodore Williams1
- Theodorico de Buckinstorff1
- Thomas F. Richardson11
- Thomas Holmes1
- Thomas Oliver Anderdon1
- Thomas Phillipps26
- Thomas Richardson1
- Thomas Thorpe1
- Timothy Manlove1
- University of Chicago Library1
- W. J. Gilbert5
- Walter Raglan Hubbard1
- Walter Sneyd1
- Warren C. Crane4
- Wilfrid Voynich1
- William Bragge1
- William Burdett-Coutts1
- William Harcourt Hooper1