Frederic Thesiger may refer to: Frederick Thesiger (naval officer) (1758–1805), British and Russian naval officer Frederic Thesiger, 1st Baron Chelmsford, (1794–1878), Lord Chancellor of England Frederic Thesiger, 2nd Baron Chelmsford, (1827–1905), British general Frederic Thesiger, 1st Viscount Chelmsford, (1868–1933), Viceroy of India