Stridsvagn m/42 (Strv m/42) was a Swedish medium tank in service in the World War II period.

Known by its manufacturer AB Landsverk as Lago II-III-IV, it fielded a 75 mm L/31 gun, the first of its size in a Swedish tank.

As a neutral nation in World War II, Sweden did not engage in combat; thus its tanks have no battlefield record.

The Strv m/42 had its origins on modifications in the Lago (the manufacturer designation) a 16-tonne (16-long-ton) light tank armed with a Hungarian 37M 40 mm cannon and three machine guns produced for the Hungarian Army in late 1930s by the AB Landsverk, itself a development of the Stridsvagn L-60 light tank also made by the AB Landsverk.

The turrets were reused as static gun pillboxes, along the major coastlines, but mostly defending harbours and more seldom airfields.