Henri Ducard is a fictional character in the "Batman" comic book universe. He was created by Sam Hamm. Ducard's first appearance was in "Detective Comics" #599 (April 1989), part of the "Blind Justice" story arc that Hamm, the screenwriter of the 1989 "Batman" movie, was asked to guest-write for "Detective Comics" by "Batman" editor Denny O'Neil.