RV Callista is a research vessel belonging to the University of Southampton's School of Ocean and Earth Science, based at the National Oceanography Centre, Southampton.

Callista is a 19.75-metre (64 ft 10 in) catamaran designed and equipped for a range of coastal and shelf research.

Callista's main function is to provide seatime for students on courses run by the university and the NOCS.

She carries a variety of sensors as standard and is equipped with both wet and dry laboratories.

[2] Propulsion is by twin Scania D12 diesel engines giving a service speed of 10 kn (19 km/h; 12 mph) and a maximum speed of 14 kn (26 km/h; 16 mph).