Former Owner
- Syon Abbey1
- Süleyman Çelebi1
- T. Fownes1
- Taqī ibn ʻAlī al-Qummī1
- Thomas Grenville1
- Thomas Herbert, 8th Earl of Pembroke1
- Thomas Kerrich1
- Thomas Mildmay1
- Thomas Mostyn1
- Thomas Pearson1
- Thomas Rawlinson1
- Thomas Shadford Walker1
- Thomas Windus1
- Timothy Neve1
- Turner Macan1
- Typographic Library and Museum1
- Vincenzo Malacarne1
- Walter Ambrose Heath Harding1
- William Beckford1
- William Cecil, 1st Baron Burghley1