The Alvis Speed 25 was a series of luxury tourers introduced for the 1937 model year. The Speed 25 was developed from the Alvis Speed 20, and was offered in saloon, drophead coupe, and roadster body styles from a range of coachbuilders such as Vanden Plas, Cross & Eliis, and Charlesworth. The Speed 25 was powered by a 3.5L inline six engine that generated 106hp, which it sent to the rear wheels via a 4 speed manual transmission. The Speed 25, alongside its bigger Alvis 4.3-Litre sibling, was considered to be one of the finest cars of its era, and was in production until 1940.