Harold Andrew "Duke" Dejan (February 4, 1909 – July 5, 2002) was an American jazz alto saxophonist and bandleader in New Orleans. Dejan is best remembered as leader of the Olympia Brass Band, including during the 1960s and 1970s when it was considered the top band in the city. Dejan suffered a stroke in 1991, which left him unable to play the saxophone, but continued as a band leader and singer until shortly before his death.