WACK (1420 AM) is a radio station broadcasting a news talk information format and licensed to Newark, New York, USA. The station is owned by Waynco Radio, Inc., and features programing from CNN Radio, ESPN Radio and Westwood One.

Wack / Whack may refer to:

• WACK, a radio station in Newark, New York
• Wrestling Association of Championship Krushers, a children's television show
• Slash symbol "/", sometimes known as a whack
• Whack Records
• Slang (from "whacked") for crazy, stupid, poor quality, unfashionable or kill
• Pierre Wack (1922–1997) was an unconventional French oil executive who was the first to develop the use of scenario planning in the private sector
• WACK! Art and the Feminist Revolution, a feminist art exhibition and book