A

• [+] 2003 in the American Le Mans Series (10 P)

C

• [+] 2003 in CART (20 P)

F

• [+] 2003 in FIA GT (11 P)

F cont.

• [+] 2003 in FIA Sportscar Championship (8 P)
• [+] 2003 in Formula One (2 C, 1 P)

G

• [+] 2003 in Grand Prix motorcycle racing (18 P)

N

• [+] 2003 in NASCAR (6 P)

S

• [+] 2003 in speedway (1 C, 7 P)

V

• [+] 2003 in V8 Supercars (6 P)

A

• 2003 American Le Mans Series season
• 2003 Asia-Pacific Rally Championship season
• 2003 Australian Formula Ford Championship

B

• 2003 Bathurst 24 Hour
• 2003 British Formula Three season
• 2003 British Touring Car Championship season

C

• 2003 CART season

D

• 2003 Dakar Rally
• 2003 D1 Grand Prix season
• 2003 Daytona 500
• Death of Daijiro Kato
• 2003 Deutsche Tourenwagen Masters season

F

• 2003 FIA GT Championship season
• 2003 FIA Sportscar Championship season
• 2003 International Formula 3000 season
• 2003 Euro Formula 3000 season
• 2003 Formula Atlantic season
• 2003 Formula Nippon season
• 2003 Formula Three Euroseries season

I

• 2003 Indianapolis 500
• 2003 Indy Pro Series season
• 2003 IndyCar Series season

L

• 2003 24 Hours of Le Mans
• 2003 1000km of Le Mans

L cont.

• List of 2003 motorsport champions

M

• 2003 Grand Prix motorcycle racing season

N

• 2002–03 New Zealand V8 season

R

• 2003 Race of Champions
• 2003 Formula Renault V6 Eurocup season
• 2003 Rolex Sports Car Series season

S

• 2003 SEAT Cupra Championship season
• 2003 Superbike World Championship season
• 2003 Swedish Touring Car Championship season

W

• 2003 Winchester 400
• 2003 World Rally Championship season
• 2003 World Series by Nissan season