The Mercedes-Benz W180 is an inline 6-cylinder saloon, coupé, and convertible made from 1954 until 1959. The models associated with the W180 chassis code were the 220a and 220S.

The W180 was one in a range of Mercedes-Benz models to informally receive the "Ponton" nickname. This was in reference to the unibody-type, pontoon-shaped exterior styling which was also featured on the later W128 line.