The Alvis Three Litre Series III sports saloon or drophead coupé, also known as TE 21, is an automobile produced by English manufacturer Alvis between 1963 and 1966 with a body built by Mulliner Park Ward.

The body was a modified version of the TC 108G styled by Graber of Switzerland but built by Mulliner Park Ward and distinguished by having twin headlights mounted one above the other.

The design was noted for its lack of bright side trim or creases moulded into the body parts.

The 2993 cc engine, first used in the 1950 TA 21, received a modified cylinder head and manifold which increased power to 130 bhp (97 kW) at 4000 rpm giving the car a top speed of 107 mph (172 km/h).

[3] Although the car was replaced by the TF 21 in 1966, the TE 21 was still in stock and "available to special order" until 1967.