The Austin-Healey 100-6 is a 2-seat roadster produced in from 1956-1959. It replaced the Austin-Healey 100 and its successor was the Austin-Healey 3000. These three models were known collectively as the Big Healeys. The 100-6 had a more powerful inline 6-cylinder engine instead of the slightly larger inline 4-cylinder and the option of 2 optional occasional seats.

The car was produced in two model designations, the 2+2 BN4 from 1956 and the 2-seater BN6 in 1958-1959. It was powered by a tuned version of the BMC C-Series engine with a output of 102 hp (76 kW), which was later increased to 117 hp (87 kW). The version with 117 hp was able to reach a top speed of 167 km/h and the average consumption of the car was 13.6 l/100 km. A total of 1,436 examples were produced.