Herman Casler

First meeting of the members of the K.M.C.D. Syndicate on September 22, 1895, from left: Henrey Norton "Harry" Marvin, William Kennedy Laurie Dickson, Herman Casler, and Elias Bernard Koopman taken at the home of Harry Marvin, Canastota, New York

Herman Casler (March 12, 1867 – July 20, 1939) was an American inventor and co-founder of the partnership called the K.M.C.D. Syndicate, along with W.K-L. Dickson, Elias Koopman, and Henry N "Harry" Marvin, which eventually was incorporated into the American Mutoscope Company in December 1895.