Wack or Whack may refer to:
People Gerhard Wack (born 1945), German politician Henry Wack (1875–1955), attorney, author, and apologist for Leopold II's misrule of the Congo Free State Pierre Wack (1922–1997), a French oil executive who was the first to develop the use of scenario planning in the private sector Tierra Whack (born 1995), an American rapper, singer, and songwriter
Arts, entertainment, and media WACK, a radio station in Newark, New York WACK! Art and the Feminist Revolution, a feminist art exhibition and book Whack, a short-lived St. John Publications comic book (1953–1954) Whack Records WACK, a Japanese music production company
Other uses Backslash symbol "\", sometimes known as a whack
See also WAC (disambiguation) Whac-A-Mole, an arcade game Wacke, or greywacke, a type of sandstone Wacker (disambiguation) Wak (disambiguation) Wank (disambiguation)