SMS Cöln was a Kolberg-class light cruiser of the German Kaiserliche Marine during the First World War. She had three sister ships, SMS Kolberg, Mainz, and Augsburg. She was built by the Germaniawerft in Kiel; her hull was laid down in 1908 and she was launched in June 1909. Cöln was commissioned into the High Seas Fleet in June 1911. She was armed with a main battery of twelve 10.5 cm SK L/45 guns and had a top speed of 25.5 kn. After her commissioning, she served with the II Scouting Group, part of the reconnaissance forces of the High Seas Fleet.

The Kolberg class was a group of four light cruisers built for the German Imperial Navy and used during the First World War. The class comprised four vessels: SMS Kolberg, the lead ship, Mainz, Cöln, and Augsburg. The ships were built between 1908 and 1910, and two, Kolberg and Augsburg, were modernized in 1916–1917. The ships were armed with a main battery of twelve 10.5 cm SK L/45 guns and had a design speed of 25.5 knots. The first three ships were assigned to the reconnaissance forces of the High Seas Fleet; Augsburg was instead used as a torpedo and gunnery training ship.