| Thatcher (Barony) |
Margaret Hilda Thatcher - Fri 26th Jun 1992
|
8 April 2013 |
- |
| Thetford (Viscountcy) |
Henry Bennet - Fri 22nd Apr 1672
|
- |
- |
| Thirlestane (Lordship) |
John Maitland - Thu 17th May 1590
|
- |
- |
| Thirlestane and Boltoun (Lordship) |
John Maitland - Thu 14th Mar 1624
|
- |
- |
| Thirlestane, Musselburgh and Boltoun (Lordship) |
John Maitland - Thu 26th May 1672
|
24 August 1682 |
- |
| Thomas (Barony) |
William Miles Webster Thomas - Fri 29th Jan 1971
|
8 February 1980 |
- |
| Thomas of Cwmgiedd (Barony) |
Roger John Laugharne Thomas - Fri 4th Oct 2013
|
- |
- |
| Thomas of Gresford (Barony) |
Donald Martin Thomas - Mon 30th Sep 1996
|
- |
- |
| Thomas of Gwydir (Barony) |
Peter John Mitchell Thomas - Wed 7th Oct 1987
|
4 February 2008 |
- |
| Thomas of Macclesfield (Barony) |
Terence James Thomas - Wed 5th Nov 1997
|
1 July 2018 |
- |
| Thomas of Swynnerton (Barony) |
Hugh Swynnerton Thomas - Tue 16th Jun 1981
|
7 May 2017 |
- |
| Thomas of Walliswood (Barony) |
Susan Petronella Thomas - Thu 6th Oct 1994
|
6 October 2023 |
- |
| Thomas of Winchester (Barony) |
Celia Marjorie Thomas - Fri 26th May 2006
|
- |
- |
| of Thomond (Earldom) |
Percy Wyndham O'Brien - Sat 11th Dec 1756
|
21 July 1774 |
- |
| Thomond (Barony) |
Murrough O'Brien - Fri 2nd Oct 1801
|
10 February 1808 |
- |
| of Thomond (Marquessate) |
Murrough O'Brien - Mon 29th Dec 1800
|
3 July 1855 |
- |
| of Thomond (Earldom) |
Murrough O'Brien - Sun 1st Jul 1543
|
- |
- |
| Thomson (Barony) |
Christopher Birdwood Thomson - Mon 11th Feb 1924
|
5 October 1930 |
- |
| Thomson of Fleet (Barony) |
Roy Herbert Thomson - Tue 10th Mar 1964
|
- |
- |
| Thomson of Monifieth (Barony) |
George Morgan Thomson - Wed 23rd Mar 1977
|
3 October 2008 |
- |