NOG or Nog may refer to:
- Nog (novel), a novel by Rudolph Wurlitzer
- NOG mouse, a variety of mice used in medical research
- Nogales International Airport (Mexico)
- N-Oxalylglycine, an organic compound
- Antônio Rodrigo Nogueira, a Brazilian mixed martial artist
- nog, slang for eggnog
- Noggin the Nog, a popular British children's television series
- Nog (Star Trek), fictional character, a young Ferengi in Star Trek: Deep Space Nine
- Brick nog, bricks filled in-between wooden framing
- Nogs in construction are small blocks or pegs of wood for example a piece of wood the size of a brick set in a chimney to nail into.