Casmir may refer to:

Agu Casmir (born 1984), Nigerian professional soccer player Norman Casmir (born 1930), German fencer Erwin Casmir (1895–1982), German fencer Gustav Casmir (1874–1910), German fencer St. Casmir Church Mathilil, a church in Mathilil, Kerala, India

See also CASMIRC Casimir Casimir effect