Miloslav Ladislav "Ladi" Geisler (November 27, 1927 – November 19, 2011) was a German musician who established a high profile in the post-war German music scene. Best known for his work with pop musicians Bert Kaempfert, James Last and Freddy Quinn, Geisler developed the distinctive "Knack-Bass" percussive bass sound that helped popularize the Bert Kaempfert Orchestra. He later released numerous records under his own name.