Thomas Dundas may refer to:
Thomas Dundas (of Fingask and Carronhall) (died 1786), MP for Orkney and Shetland Thomas Dundas, 1st Baron Dundas (1741–1820), British politician Thomas Dundas (British Army officer) (1750–1794), governor of Guadaloupe Thomas Dundas (Royal Navy officer) (c. 1765–1841), British naval officer of the Napoleonic Wars Thomas Dundas, 2nd Earl of Zetland (1795–1873), British nobleman and politician Thomas Dundas (High Sheriff) of Sussex