Cassirer is a German surname. Notable people with the surname include:
Richard Cassirer (1868–1925), German neurologistPaul Cassirer (1871–1926), German art dealer and editorBruno Cassirer (1872–1941), German publisher and gallery owner in BerlinErnst Cassirer (1874–1945), German-Jewish philosopherEdith Geheeb (1885–1982)Fritz Cassirer (1871–1926), German conductorHeinz Cassirer (1903–1979), German philosopherWilfred Cass, born Wolfgang Cassirer (born 1924), Founder of Cass Sculpture Foundation