The 1991 Australian Drivers' Championship was a CAMS sanctioned national motor racing title for drivers of Formula Brabham racing cars. The winner of the championship was awarded the 1991 CAMS Gold Star.
Touring car driver Mark Skaife won his first Australian Drivers' Championship. All seven rounds of the series were held at the new Eastern Creek Raceway in Sydney.
The title was contested over a seven-round series:
Championship points were awarded on a 20–15–12–10–8–6–4–3–2–1 basis to the top ten finishers in each round. Australian Formula 2 cars were invited to compete in Rounds 4, 5, 6 & 7 however only the ten best placed Formula Brabham drivers were eligible to score points. The best six performances from the seven rounds were counted towards a driver's points total.