Ermis (Α-373) (, "Hermes") was an auxiliary ship of the Hellenic Navy, which served from 1988 to 2002 as an electronic surveillance ship. She started her career as the 1500 tn trawler Hoheweg. In 1961 she was converted to an electronic surveillance ship by the German Navy and named Oker (A-53). In German Navy service she was classified as a Flottendienstboot (fleet service vessel), in Class 422.