Marquess of Thomond

==Holders==
 	From 	Until 	Name 	Lifespan
1.	29 December 1800	10 February 1808	The Most Hon. Murrough O'Brien, 1st Marquess of Thomond, K.P., P.C. 	1726-1808
2.	10 February 1808	21 August 1846 	The Most Hon. William O'Brien, 2nd Marquess of Thomond, K.P., P.C. 	1765-1846
3.	21 August 1846 	3 July 1855 	Admiral The Most Hon. James O'Brien, 3rd Marquess of Thomond, G.C.H.	1768-1855
==Other Titles==
===Peerage of Ireland===
*Earl of Inchiquin (1654), 1800-1855
*Baron Inchiquin (1543), 1800-1855
*Baron O'Brien (1654), 1800-1855
===Peerage of the United Kingdom===
*Baron Thomond (1801), 1801-1808
*Baron Tadcaster (1826), 1826-1846