Swallow Sidecar Company, Swallow Sidecar and Coachbuilding Company, and Swallow Coachbuilding Company were trading names used by Walmsley & Lyons, partners and joint owners of a British manufacturer of motorcycle sidecars and automobile bodies in Blackpool, Lancashire, before incorporating a company in 1930 to own their business, which they named Swallow Coachbuilding Company Limited.

Sir William Lyons, known as "Mr. Jaguar", was with fellow motorcycle enthusiast William Walmsley, the co-founder in 1922 of the Swallow Sidecar Company, which became Jaguar Cars Limited after the Second World War.