Lācis (Old orthography: Lahz(i)(s); feminine: Lāce) is a Latvian surname, derived from the Latvian word for "bear". Individuals with the surname include:
Asja Lācis (1891–1979), Latvian actress Dzintars Lācis (1940–1992), Latvian cyclist Kārlis Lācis (born 1977), Latvian composer Vilis Lācis (1904-1966), Latvian author and Premier of Latvian SSR
See also Latsis, same surname, transliterated from Russian