SMS Rostock was a light cruiser of the Karlsruhe class built by the German Kaiserliche Marine. She had one sister ship, SMS Karlsruhe; the ships were very similar to the previous Magdeburg-class cruisers. The ship was laid down in 1911, launched in November 1912, and completed by February 1914. Armed with twelve 10.5 cm SK L/45 guns, Rostock had a top speed of 28.5 knots and displaced 6,191 t at full load.

The Karlsruhe class of light cruisers was a pair of two ships built for the German Imperial Navy before the start of World War I. The ships—SMS Karlsruhe and Rostock—were very similar to the previous Magdeburg-class cruisers, mounting the same armament and similar armor protection, though they were larger and faster than the earlier ships. Both vessels were laid down in 1911, and launched one day apart, on 11 and 12 November 1912. Karlsruhe joined the fleet in January 1914, but fitting out work lasted slightly longer on her sister; Rostock was commissioned the following month.