HSwMS Fenris was a monitor that served with the Swedish Navy from 1872 to 1903.

[1] She was an experimental small coastal defense monitor and while not seen as a success, experience gained in her development was used in the later Sölve class of monitors.

[2] Despite being of the John Ericsson class, she was closest in design to HSwMS Garmer.

[2] She had a coal capacity of nine tons and her propulsion system generated 44 indicated horsepower, with one propeller and one funnel.

[3] She was armed with a single 15-inch (381 mm) M/65 Dahlgren gun.