Geoffrey John Brabham^[1] (born 20 March 1952) is an Australian racing driver. Brabham spent the majority of his racing career in the United States.

He raced successfully in CART early in his career, finishing 8th in 1982, 1984 and 1987 with nine podiums. In ten appearances in the Indianapolis 500, he had a best result of fourth in 1983 and fifth in 1981.

His greatest source of success was in various forms of sports cars, winning four IMSA GTP titles (1988–1991) when racing for Nissan, and one Can-Am championship (1981).

Brabham also won the 1993 24 Hours of Le Mans driving one of the factory Peugeot 905 alongside French drivers Éric Hélary and Christophe Bouchut. His younger brother David Brabham had won the GT class in the race driving a Jaguar XJ220 for Tom Walkinshaw Racing, but the team was later disqualified for technical infringements. Geoff Brabham became just the third Australian driver to win Le Mans after Bernard Rubin (1928) and Vern Schuppan in 1983. David Brabham would also go on to win Le Mans in 2009, also driving for the factory Peugeot team.

Later in his career, Brabham returned to Australia, where he was runner-up in the 1995 and 1997 Australian Super Touring Championship, and won the 1997 Bathurst 1000 Super Touring race driving a BMW 320i alongside brother David. The pair initially finished second behind BMW Motorsport Australia teammates Paul Morris and Craig Baird, but a blunder by the team left Baird in his car at the final pit stop which meant that by the end of the race, the Kiwi driver had breached the race regulation which limited any one driver to a maximum of three hours continuous driving. This caused their disqualification and handed the win to the Brabham brothers.

Brabham dabbled in V8 Supercar drives in his native Australia throughout his career. He is still one of the few drivers to win his first race, Sandown 500 in 1993. He started eleven races for one victory.

Brabham took two race victories in the International Race of Champions stock car series (1992 and 1993), both at Michigan. He made his only NASCAR Winston Cup Series start at the first ever Brickyard 400 at Indianapolis in 1994, driving for Michael Kranefuss. Brabham crashed in the second half of the race.

He is the son of three-time Formula One World Champion Jack Brabham. He has two younger brothers; Gary and David. Geoff teamed with David to win the 1997 Bathurst 1000 in a BMW, becoming the only brothers to have combined to win the race. Although the most successful of the second generation of racing Brabhams, unlike his siblings he did not compete in World Championship Formula One.

Married to Roseina Brabham, a multi-time jet-ski champion, Brabham has retired from competition himself to focus on his son Matthew's racing career. After a successful karting career, Matthew moved into international open-wheel racing and the Road to Indy ladder; he is also a three-time Stadium Super Trucks champion.

He was inducted in the Motorsports Hall of Fame of America^[2] in 2004. In 2014, Brabham was assigned as the chief director of Nissan and its developer Nismo.

(key) (Races in bold indicate pole position)

Year	Team	Co-drivers	Car	Class	Laps	Pos.	Class pos.
1989	Nissan Motorsport	Chip Robinson Arie Luyendyk	Nissan R89C	C1	250	DNF	DNF
1990	Nissan Performance Technology Inc.	Chip Robinson Derek Daly	Nissan R90CK	C1	251	DNF	DNF
1993	Peugeot Talbot Sport	Éric Hélary Christophe Bouchut	Peugeot 905 Evo 1B	C1	375	1st	1st

Year	Car#	Team	Co-drivers	Car	Class	Laps	Pos.	Class pos.
1974	31	WA Fisher (Holdings) Pty Ltd	Bernie Haehnle	Mazda RX-3	2001 – 3000cc	151	8th	3rd
1975	36	B S Stillwell Ford & Co Pty Ltd	Mike Stillwell	Ford Escort RS2000	B	141	12th	5th
1977	4	John Goss Racing Pty Limited	Jack Brabham	Ford XC Falcon GS500 Hardtop	3001cc – 6000cc	141	18th	9th
1993	35	Peter Jackson Racing	David Parsons	Ford EB Falcon	A	154	6th	6th
1997*	83	BMW Motorsport Australia	David Brabham	BMW 320i	A	161	1st	1st
1998	25	Longhurst Racing	Tony Longhurst	Ford EL Falcon	OC	157	8th	8th
1999	6	Ford Tickford Racing	Neal Bates	Ford AU Falcon		160	10th	10th
2000	54	Rod Nash Racing	Cameron McConville	Holden VT Commodore		105	DNF	DNF
2001	31	Steven Ellery Racing	Steven Ellery	Ford AU Falcon		161	7th	7th

* Super Touring race

Year	Car#	Team	Co-drivers	Car	Class	Laps	Pos.	Class pos.
1993	35	Peter Jackson Racing	David Parsons	Ford EB Falcon	V8	161	1st	1st
1994	23	Diet Coke Racing	Paul Morris	Holden VP Commodore	V8	94	NC	NC
1998	25	Longhurst Racing	Tony Longhurst	Ford EL Falcon	OC	7	DNF	DNF

(key) (Bold – Pole position awarded by qualifying time. Italics – Pole position earned by points standings or practice time. * – Most laps led.)

• Geoff Brabham career summary at DriverDB.com
• Conrod Profile - V8 Supercar stats.
• Geoff Brabham driver statistics at Racing-Reference
• CART/USAC Results