McClennan is a surname. Notable people with the surname include:
Alonzo Clifton McClennan (1855–1912), American physician Brian McClennan (born 1962), New Zealand rugby league player and coach Darren McClennan (born 1965), New Zealand soccer player
Mike McClennan (1944–2019), New Zealand rugby league player and coach Tommy McClennan (1908–1962), American blues singer and guitarist