Henry Thomas Mayo (8 December 1856 – 23 February 1937) was an admiral of the United States Navy. Mayo was born in Burlington, Vermont, 8 December 1856. Upon graduation from the United States Naval Academy in 1876 he experienced a variety of naval duties including coastal survey. During the Spanish-American War he served in the gunboat Bennington (PG-4) off the west coast of North America. Appointed rear admiral in 1913, he commanded the naval squadron involved in the Tampico incident of 9 April 1914. His demands for vindication of national honor further accentuated the tense relations with Mexico.