Edward G. Leffingwell (December 3, 1941 – August 5, 2014) was an American art critic and curator, affiliated with MoMA/P.S.1 and Art in America and associated with avant-garde art. Leffingwell was born in Sharon, Pennsylvania, on December 3, 1941. In the mid-1960s he moved to New York City and began associating with Max's Kansas City and the Warhol Factory crowd. During the 1960s and 1970s he was involved with a variety of avant-garde art projects, including a 1969 film by sculptor John Chamberlain ("The Secret Life of Hernando Cortez").