Megaw is a surname. Notable people with the surname include:
Helen Megaw (1907–2002), Irish crystallographer
John Megaw (1909–1997), British judge and rugby union player
Peter Megaw (1910–2006), Irish architectural historian and archaeologist
Robert Megaw (1869–1947), Northern Irish barrister and politician
Vincent Megaw (born 1934), Australian archaeologist, also his wife Ruth Megaw