Tennyson-d'Eyncourt is a surname, and may refer to:
Charles Tennyson-d'Eyncourt (1784–1861), British landowner and politician Edwin Tennyson-d'Eyncourt (1813–1903), British Royal Navy officer Sir Eustace Tennyson-d'Eyncourt, 1st Baronet (1868–1951), British naval architect and engineer Sir Gervais Tennyson-d'Eyncourt, 2nd Baronet (1902–1971), son of the 1st Baronet