HDMS Thetis is a Thetis-class ocean patrol vessel belonging to the Royal Danish Navy.

In mid-1990s the ship served as a platform for seismic operations in the waters near Greenland.

In 2002 she took over the role from her sister ship Hvidbjørnen as a platform for Commander Danish Task Group.

A squad of soldiers from the Frogman Corps was deployed aboard the ship.

This article about a specific military ship or boat of Denmark is a stub.