William MacGregor (disambiguation)

William MacGregor (1846–1919) was a Lieutenant-Governor of British New Guinea, Governor of Newfoundland and Governor of Queensland.

William or Bill(y) MacGregor may also refer to:

• Sir William Macgregor, 2nd Baronet (1817–1846), British Army officer
• William MacGregor (Australian politician) (1853–1899), New South Wales politician
• William York Macgregor (1855–1923), Scottish landscape painter
• William MacGregor (judge) (1862–1934), New Zealand King's Counsel
• William Firth MacGregor (1896–?), painter, illustrator and artist
• William Macgregor (cricketer) (1888–1980), Australian cricketer and veterinarian