| Race Title: | Portland Grand Prix |
| Venue: | Portland International Raceway |
| First Race: | 1978 |
| Last Race: | 2006 |
| Previous Names: | Rose City Grand Prix |
| Most Wins Driver: | Al Holbert (3) |
| Most Wins Team: | Holbert Racing (4) |
| Most Wins Manufacturer: | Porsche (8) |
The Portland Grand Prix was a sports car race held at the Portland International Raceway in Portland, Oregon from 1978 until 2006. It began as a round of the IMSA GT Championship, and became an American Le Mans Series race in 1999.
| Date | Overall Winner(s) | Entrant | Car | Distance/Duration | Race Title | Report | |
|---|---|---|---|---|---|---|---|
| IMSA GT Championship | |||||||
| 1978 | 100miles | G.I. Joe's Grand Prix | report | ||||
| 1979 | 100miles | G.I. Joe's Grand Prix | report | ||||
| 1980 | 100miles | G.I. Joe's Grand Prix | report | ||||
| 1981 | 100miles | G.I. Joe's Grand Prix | report | ||||
| 1982 | 100miles | G.I. Joe's Toyota Grand Prix | report | ||||
| 1983 | 3 hours | G.I. Joe's Grand Prix | report | ||||
| 1984 | 3 hours | G.I. Joe's Grand Prix | report | ||||
| 1985 | 300km (200miles) | G.I. Joe's Grand Prix | report | ||||
| 1986 | 300km (200miles) | G.I. Joe's Grand Prix | report | ||||
| 1987 | 300km (200miles) | G.I. Joe's Grand Prix | report | ||||
| 1988 | 300km (200miles) | G.I. Joe's Camel Grand Prix | report | ||||
| 1989 | 300km (200miles) | G.I. Joe's Camel Grand Prix | report | ||||
| 1990 | 300km (200miles) | G.I. Joe's Camel Grand Prix | report | ||||
| 1991 | 300km (200miles) | report | |||||
| 1992 | 2 hours | report | |||||
| 1993 | 1 hour, 45 minutes | G.I. Joe's/Camel Grand Prix | report | ||||
| 1994 | 2 hours | Grand Prix of Portland | report | ||||
| 1995 - 1998 | Not held | ||||||
| American Le Mans Series | |||||||
| 1999 | 2 hours, 45 minutes | Rose City Grand Prix | report | ||||
| 2000 | 2 hours, 45 minutes | Decision Point Applications Rose City Grand Prix | report | ||||
| 2001 | 2 hours, 45 minutes | Grand Prix of Portland | report | ||||
| 2002 - 2003 | Not held | ||||||
| 2004 | 2 hours, 45 minutes | Portland Grand Prix | report | ||||
| 2005 | 2 hours, 45 minutes | Portland Grand Prix | report | ||||
| 2006 | 2 hours, 45 minutes | Tires Les Schwab presents Portland Grand Prix | report | ||||