McTiernan is a surname. Notable people with the surname include:
Dervla McTiernan, Irish crime novelist Edward McTiernan (1892–1990), Australian jurist, lawyer and politician John McTiernan (born 1951), American film director and producer
See also Alannah MacTiernan (born 1953), Australian politician McKiernan Clan McKernan (surname) McKiernan McTernan Kernan (disambiguation) Tiernan