The Thetis Class Corvettes, originally developed for the German Navy and first commissioned in 1961, is a class of naval vessel currently in service in the Hellenic Navy.

Similar in size to corvettes, all three vessels were built by Rolandwerft, Bremen.

The Thetis class carries a complement of 20mm and 40mm guns, Mk 46 Mod5 torpedoes and mines, and are equipped with sonar.

Recently, the A/S mortars have been replaced by a second 40mm gun and single torpedo tubes by triple mountings. Upgrades started in 2000 may have included enclosed 40mm gun mountings and Rheinmetall 20mm guns to replace the MGs.