Laci or LACI may refer to:
People
Given name
- Laci Boldemann (1921–1969), Swedish composer of German and Finnish descent
- Laci Endresz, (born 1974), English circus performer who performs as Mooky the Clown
- Laci Green (born 1989), American YouTube personality
- Laci Mosley, American actress, comedian, and podcaster
- Laci Peterson, a 2002 murder victim
- Laci Scott (born 1987), American beauty queen, 2005 Miss Oklahoma USA
Nickname
- László Babai (born 1950), Hungarian professor of computer science and mathematics
- László Várkonyi (1909–1972), Hungarian table tennis player
Surname
- Mergim Laci (born 2 April 1998) is a Swedish footballer
- Qazim Laçi (born 1996), Albanian footballer
- Vasil Laçi (1922–1941), Albanian would-be assassin of King Victor Emmanuel III of Italy and Albanian Prime Minister Shefqet Bej Vërlaci after the Italian occupation of Albania
- Žiga Laci (born 2002), Slovenian footballer
- de Laci, the surname of an old Norman noble family
Acronym
- Lac repressor (LacI), a DNA-binding protein
- Lacunar stroke or lacunar cerebral infarct (LACI), a type of stroke
- LA Cleantech Incubator (LACI), Los Angeles's official cleantech business incubator