William Abbott or Abbot' may refer to:

• Bud Abbott (1895–1974), real name William Alexander Abbott, of the Abbott and Costello comedy team
• William Abbott (Australian politician), member of the New South Wales Legislative Assembly
• William Abbott (manager), theatrical manager in Charleston, South Carolina
• William Hawkins Abbott (1819–1901), oilman and builder of the first petroleum refinery
• William Louis Abbott (1860–1936), American ornithologist and medical doctor
• William Osler Abbott (1902–1943), American physician
• William Abbot, English actor
• William Knight (martyr), real name William Abbot
• William Abbott Herdman (died 1924)
• Billy Abbott, fictional character on The Young and the Restless

This disambiguation page lists articles associated with the same personal name. If an internal link led you here, you may wish to change the link to point directly to the intended article.