Casady is a surname. Notable people with the surname include:
Casady family of Iowa Bianca Leilani Casady, member of CocoRosie Guymon Casady (born 1969), American talent manager and producer Ian Casady (born 1980), American professional ballet dancer Jack Casady (born 1944), American bass guitarist Jefferson P. Casady (1823–1898), American politician Phineas M. Casady (1818–1908), American politician Robin Casady (died 2020), American businessman Samuel H. Casady ( 1831–1873), American politician Sierra Rose Casady, member of CocoRosie Simon Casady (1852–1928), American banker Simon Casady (1908–1995), journalist and political figure Thomas Casady (1881–1958), bishop of Oklahoma Virginia Casady, American politician