The Austin-Healey 100-6 is a two-seat roadster that was announced in late September 1956[3] and produced from 1956 until 1959.

The 100-6 featured a 2 in (50.8 mm) longer wheelbase than the 100, a more powerful straight-six engine in place of its slightly larger inline-four, and added two occasional seats (which later became optional).

The body lines were slightly streamlined, a smaller, wider radiator grille placed lower, an air scoop was added to the bonnet, and the windscreen fixed.

The cars used a tuned version of the BMC C-Series engine previously fitted to the Austin Westminster, initially producing 102 bhp (76 kW) and increased in 1957 to 117 bhp (87 kW) by fitting a revised manifold and cylinder head.

In late 1957 production was transferred from Longbridge to the MG plant at Abingdon.