Thomas Mostyn

Thomas Mostyn may refer to:

• Sir Thomas Mostyn, 2nd Baronet (1651–1692), one of the Mostyn baronets
• Thomas Mostyn (sea captain) (fl. 1695–1697), sea captain and slave trader
• Sir Thomas Mostyn, 4th Baronet (1704–1758), British landowner and politician
• Sir Thomas Mostyn, 6th Baronet (1776–1831), Welsh politician
• Thomas Lloyd-Mostyn (1830–1861), British politician