The Martini Mk23 was a racecar designed by Tico Martini which was raced in the 1978 season of Formula One.

The Mk23 made its debut at the 1978 South African Grand Prix being driven by René Arnoux. The car did not qualify. The car had a Ford Cosworth DFV V8 engine and rode on Goodyear tyres. The car had an aluminium monocoque chassis, weighed 605kg, had a 200l fuel tank and was fitted with a Hewland FGA 400 gearbox.

The car was not a big success with it only managing to finish three of the nine races it was entered in, (although it did not qualify for three of these).