Didier Maurice Theys (born 19 October 1956) is a Belgian sports car driver. He is a two-time overall winner of the 24 Hours of Daytona (1998 and 2002);O’Malley, J: "Daytona 24 Hours", David Bull Publishing, pps. 377 and 384. a winner of the 12 Hours of Sebring (1998); the Sports Racing Prototype driver champion of the Grand-American Road Racing Association (2002)Hyde, C: "Grand American Road Racing Yearbook 2002", Stalker International Editions, p. 129 and the winner of the 24 Hours of Spa (1987 in a factory BMW). He was also the polesitter (1996) and a podium finisher at the 24 Hours of Le Mans (1997, 1998 and 1999). The podium finish in 1999 was a third overall in the factory Audi R8R with co-drivers Emanuele Pirro and Frank Biela. Theys' first appearance at Le Mans was in 1982, while his last start in the world's most famous endurance sports car race came 20 years later in 2002.
Theys competed in the Champ Car Indy Car Series from 1987 to 1993 with 47 career starts,Bridgestone Presents the Champ Car World Series Powered by Ford 2006 Media Guide, Champ Car, p. 236 including the Indianapolis 500 three times (1989, 1990 and 1993).Davidson, D. and Shaffer, R: "Autocourse Official History of the Indianapolis 500", Crash Media Group Ltd., pps. 359, 360, 361. He finished in the top ten 10 times in CART events, and his best career finish in that series was a third position in Miami in 1988.
Theys' 1998 season was a record-setter, as in addition to winning Daytona and Sebring, He also won the Six Hours of Watkins Glen.
Theys also finished second overall in the FIA Sportscar Championship that year, winning at Paul Ricard, France.
Theys also drove a Maserati MC 12 for Doran Racing in the ALMS in 2007, an effort that stunned the GT1 class when it beat the factory Corvettes to win the pole at the Petit Le Mans that year.
Theys received the prestigious Driver of the Year Award in his native Belgium in 2002.
| 1986 ! Martini USA ! Martini MK 47, MK 50 ! Volkswagen Bertil Roos | LBH 4 | IRP 1 | Milwaukee Mile | DET Ret | MEA 1 | CLE 1 | Road America 13 | MOH 8 | Road America 2 | LS 2 | PHX Ret | MIA 1 | STP 1 | 1st | 155 |
| 1987 ! Newman Teamworks | LBH 7 | PHX | INDY | MIL | POR | MEA | CLE | TOR | MCH | POC | ROA 22 | MOH | NAZ | LAG | 30th | 6 !rowspan=2 | ||||
| 1988 ! Dick Simon Racing | PHX | LBH | INDY | MIL | POR 10 | CLE 9 | TOR 18 | MEA 21 | MCH | POC | MOH 10 | ROA 23 | NAZ | LAG 8 | Tamiami Park 3 | 15th | 29 ! | |||
| 1989 ! Arciero Racing | PHX 20 | LBH 23 | INDY 20 | MIL 17 | 21st | 9 !rowspan=3 | ||||||||||||||
| 1990 ! Vince Granatelli Racing | PHX 14 | LBH 11 | INDY 11 | MIL | DET 13 | POR 20 | CLE 23 | MEA 28 | TOR 7 | MCH | DEN 9 | VAN 25 | MOH 16 | ROA | NAZ | 18th | 15 !rowspan=2 | |||
| 1991 ! Leader Card Racing | SRF | LBH 10 | PHX | INDY DNQ | MIL | DET DNQ | POR 22 | CLE 12 | MEA 20 | TOR 13 | MCH | DEN 23 | VAN | MOH 23 | ROA 25 | NAZ | LAG 14 | 25th | 4 ! | |
| 1992 ! Hall/VDS Racing | SRF | PHX | LBH | INDY DNQ | DET | POR | MIL | NHA | TOR | MCH | CLE | ROA | VAN | MOH | NAZ | 40th | 0 ! rowspan=2 | |||
| 1993 ! Hemelgarn Racing | SRF | PHX | LBH | INDY 22 | MIL | DET | POR | CLE | TOR | MCH | NHA | ROA | VAN | MOH | NAZ | 42nd | 0 ! rowspan=2 | |||
| 1994 ! Project Indy | SRF | PHX | LBH | INDY DNQ | MIL | DET | POR | CLE | TOR | MCH | MOH | NHA | VAN | ROA | NAZ | LAG | ! NC ! – ! |
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