NAK is the negative-acknowledge character used in computers and telecommunications.
NAK or Nak may also refer to:
Nak, Hungary NaK, an alloy of sodium and potassium metals Mae Nak Phra Khanong, a ghost of Thai folklore Nak (film), a 2008 animated film based on the Thai ghost Ningalkkum Aakaam Kodeeshwaran, a quiz show in Malayalam based on Who Wants To Be A Millionaire? NAK, the IATA airport code for Nakhon Ratchasima Airport
People Igor Nak (born 1963), Russian political figure Vladimir Nak (1935–2010), Russian transport engineer Nicolas Aubé-Kubel (born 1996), Canadian ice hockey player sometimes abbreviated as "NAK"
Science Sodium-potassium alloy,commonly abbreviated See also NakNak, collectable toy line by Hasbro
Knack (disambiguation) KNAK (disambiguation), including callsign K-NAK Nack (disambiguation) NAC (disambiguation) NAKS (disambiguation) Naq (disambiguation) WNAK (disambiguation), including callsign W-NAK