Kalai may refer to:
- Kalai, salem hero from tamilnadu
- Ehud Kalai, prominent American game theorist and mathematical economist
- Gil Kalai (born 1955), Henry and Manya Noskwith Professor of Mathematics at the Hebrew University of Jerusalem
- Hanoch Kalai (1910–1979), member of Irgun and Lehi and an expert on the Hebrew language
- Iosif Kalai (born 1980), Romanian football player of Hungarian ethnicity
- Leslie Kalai (born 1984), Papua New Guinean footballer who is a goalkeeper
- Varma Kalai, martial art and esoteric healing art originating from ancient Tamil Nadu in South India
- Kalai, Iran, village in Gilan Province, Iran
- Kalai, Cambodia, commune in Ou Chum District in northeast Cambodia
- Kalai Upazila, Upazila of Joypurhat District in the Division of Rajshahi, Bangladesh
- Kaivantha Kalai, South Indian Tamil film Written and directed by Pandiarajan released in 2006
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