STS Mir (Russian meaning World or Peace) is a three-masted, full rigged Sail Training Ship, based in St. Petersburg, Russia. She was built in 1987 at the Lenin Shipyard in Gdansk, Poland.

Mir is the second largest of six sister ships designed by Zygmunt Chore„ and weighs 2,385 tonnes. She is 109.2 metres long, with a beam of 13.9 m and a draught of 6.3 m. The main mast is 52 m high and along with the other masts supports a total sail area of 2,771 m2.