This is a list of some people with the surname Klein;
- Felix Klein (1849-1925), German mathematician.
- Isaac Klein (1905-1979), US Rabbi.
- Lawrence Klein (born 1920), US economist.
- Melanie Klein (1882 - 1960), British psychotherapist.
- Naomi Klein (born 1970) Canadian author.
- Ralph Klein (born 1942), Canadian politician.
- Yves Klein (1928 - 1962) French artist.
