HSwMS Spica (T121) is a former Swedish Navy Spica-class, torpedo-armed, fast attack craft (FAC), now a museum ship at the Vasa Museum in Stockholm, Sweden.
The vessel was one of three constructed in the 1960s by Götaverken AB on Hisingen, the other two being HSwMS Sirius (T122) and HSwMS Capella (T123). Three similar vessels were built by Karlskronavarvet.
The vessel was taken out of service in 1989 and made into a museum ship at the Naval Museum in her former home port of Karlskrona until 2002. It is a listed historic ship of Sweden.