The JH23 was a Formula One car built and raced by the AGS team for the 1988 Formula One season. It was powered by the Ford Cosworth DFZ engine. A single car was entered, driven by experienced Frenchman Philippe Streiff.

The car was updated with a Ford Cosworth DFR engine for the 1989 season, to become the JH23B and for the first time the team entered two cars.

The drivers were Phillipe Streiff and the rookie German Joachim Winkelhock. The season got off to a tragic start as Streiff was seriously injured in a pre-season testing crash at the Jacarepaguá circuit in Brazil. This left him paralysed and thus using a wheelchair.

Italian Gabriele Tarquini took over from Streiff and had a good season, the highlight being a 6th place in Mexico. However his teammate Winkelhock and later on Yannick Dalmas failed to get past pre-qualifying.

By Spa the car was replaced by the JH24.