McIlwraith or Mcilwraith is a surname. Notable people with the surname include:
Alan Mcilwraith (born 1978), Scottish fraudster
Andrew McIlwraith (1844-1932), co-founder of McIlwraith, McEacharn & Co, brother of John and Thomas
David McIlwraith, Canadian TV actor active since the 1970s
John McIlwraith (businessman) (1828-1902), Manufacturer, Mayor of Melbourne 1873-1874, brother of Andrew and Thomas
John McIlwraith (commentator) - a Scottish-Canadian radio broadcaster
John McIlwraith (cricketer) (1857-1938), Australian cricket player
Thomas McIlwraith (1835-1900), three time Premier of Queensland 1879-1883, 1888, and 1893; brother of Andrew and John
