SMS G42 was a 1913 Type Large Torpedo Boat (Großes Torpedoboot) of the Imperial German Navy (Kaiserliche Marine) during World War I, and the 18th ship of her class.

Built by Germaniawerft in Kiel, she was laid down in February 1915,[citation needed] launched on 20 May 1915 and commissioned on 10 November 1915.

326 tonnes (321 long tons) of fuel oil was carried, giving a range of 1,950 nautical miles (3,610 km; 2,240 mi) at 17 knots (31 km/h; 20 mph).

[3] G42 was a member of the Third Torpedo Boat Flotilla, Sixth Half-Flotilla of the High Seas Fleet at the Battle of Jutland.

The Sixth Half Flotilla sank the British destroyer Flirt, which had stopped to rescue survivors of a drifter that had been hit in an earlier attack, before returning to base.

[12][13] At about 23:30 hr on 20 April Gruppe Gautier encountered the trawler Sabreur and attacked with gunfire, scoring two hits.

It then moved off down the Channel to attack the Dover Barrage, but encountered the British Flotilla Leaders Broke and Swift.