Others
- William Adams (sailor) (1564–1620), English sailor and visitor to Japan (and later naturalized citizen and samurai of Japan)
- William Adams (master) (1706/7–1789), English scholar
- William Adams (potter) (c. 1746–1805), North Staffordshire potter, founded the Greengates Pottery
- William Adams (lawyer) (1772–1851), English lawyer notable for his part in negotiating settlements with the United States in the 1814/1815 period
- William Adams (oculist) (1783–1827), English ophthalmic surgeon
- William Bridges Adams (1797–1872), British author, inventor & locomotive engineer
- William Adams (locomotive engineer) (1823–1904), British locomotive engineer
- William Adams (minister) (1807–1880), United States religious leader and college president
- William Bridges-Adams (theatre director) (1889–1965), British stage director
- William Adams (author) (1814–1848), English religious writer
- William Adams (Royal Navy officer) (died 1748), captain of HMS Harwich in the Royal Navy
- will.i.am (William James Adams, Jr., born 1975), musician, producer, and member of The Black Eyed Peas
- Willy Northpole (William Adams, born 1980), rapper signed to Ludacris' DTP Records
- William Grylls Adams (1836–1915), professor of Natural Philosophy
- William Wirt Adams (1819–1888), American Confederate Army general
- William Henry Davenport Adams (1828–1891), English writer and journalist
- William Davenport Adams (1851–1904), English writer and journalist, son of W. H. D. Adams
- William Drea Adams, president of Bucknell University, 1995–2000
- William E. Adams (1939–1971), Vietnam Medal of Honor recipient
- William Adams (haberdasher) (1585–1661), London haberdasher and founder of Adams' Grammar School in 1656
- William Y. Adams, Herskovitz Prize-winning author for Nubia: Corridor to Africa
- Billy Adams (musician), banjo player, a former member of Dexys Midnight Runners
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