The Laurin & Klement OK was a car produced from 1914 until 1916. It was developed by Reichenberger Automobil-Fabrik (RAF) and manufactured by Laurin & Klement, with whom RAF merged with in 1913.
The engine was a 2413 cm ³ inline four-cylinder unit with a power output of 22 kW (30 hp). The bore was 80 mm and the stroke was 120 mm. The chassis was the same as that found in the Laurin & Klement O. The car could reach 65-70 km/h.
A total of 25 were made.