William, Bill or Billy Abbot/Abbott may refer to:
Businessmen William Hawkins Abbott (1819–1901), American oil producer and trader William J. Abbott (born 1962), American businessman and CEO of Great American Media
Performers William Abbot (actor) (1790–1843), English actor and theatrical impresario Bud Abbott (William Alexander Abbott, 1897–1974), American vaudeville and film actor, of Abbott and Costello
Physicians William Louis Abbott (1860–1936), American physician and philanthropist William Osler Abbott (1902–1943), American physician noted as co-developer of Miller-Abbott tube
Politicians William Abbot (politician) (), English politician William C. Abbott (c. 1817–1863), member of the Texas Senate William Abbott (Australian politician) (1844–1924), Australian political figure; represented electoral district of Upper Hunter 1889 to 1891 William Abbott (Newfoundland politician) (1888–1974), Newfoundland merchant and politician
Sportsmen William Abbott (cricketer) (1856–1935), English cricketer William Abbott (footballer) (), English outside-left Bill Abbott Jr. (born 1954), Canadian Olympic sailor and boatbuilder
Others William L. Abbott (1861–1951), American mechanical engineer Billy Abbott, a character on the American daytime soap opera The Young and the Restless William Wright Abbot (1922–2009), American archivist and historian
See also William Abbotts (1736–1805), English landowner, co-founder of "Original Baths"
Abbott (surname)