Vlach (feminine Vlachová) is a Czech surname, a reference to Vlachs. Notable people with this surname include:
Jaroslav Vlach (born 1992), Czech ice hockey player Josef Vlach, founder of the Vlach Quartet Karel Vlach (1911–1986), Czech dance orchestra conductor and arranger Martin Vlach (electrical engineer), American engineer Martin Vlach (pentathlete), Czech modern pentathlete Miroslav Vlach (1935–2001), Czech ice hockey player Renata Vlachová, Czech orienteer Roman Vlach (born 1989), Czech ice hockey player
See also Vlah (disambiguation)