Grumpy may refer to:
- Mildly cynical
- Grumpy Old Men (film)
- Grumpier Old Men
- Grumpy Old Men (TV series)
- Grumpy Old Women
- The Grumpy Old Bookman
- Mr. Grumpy
- Grumpy, a character from the 1937 Disney film Snow White and the Seven Dwarfs
- Grumpy, a character from the 1974 TV series Land of the Lost