Mysia ( or ; , , ) was a region in the northwest of ancient Asia Minor or Anatolia (part of modern Turkey). It was located on the south coast of the Sea of Marmara. It was bounded by Bithynia on the east, Phrygia on the southeast, Lydia on the south, Aeolis on the southwest, Troad on the west and by the Propontis on the north. In ancient times it was inhabited by the Mysians, Phrygians, Aeolian Greeks, and other groups.
Mysia may refer to:
- Mysia, an ancient region in northwest Anatolia
- Mysia, Victoria, a town in Australia