Fraser Gehrig (born 3 March 1976) is an Australian rules footballer in the Australian Football League (AFL) currently listed with the St Kilda Football Club.
Gehrig has been a versatile player during his AFL career, beginning his career at West Coast before becoming known as a powerful goal kicker and Coleman medalist at St Kilda.
Gehrig holds the bench press record at both West Coast and St Kilda and is the best bench press performer in the AFL, regarded by many as the strongest and most intimidating player in the AFL.
Gehrig struggled to break into a powerful Eagles lineup during his first few years at the Western Australian club, but he stepped up in 1997 and won selection in the All-Australian Team on a forward pocket.
Gehrig had a season on the half-forward line in 1998, but struggled with injury and form over the following two years and was traded to St Kilda at the end of the 2000 season. West Coast received David Sierakowski and 2000 AFL Draft selection number 18 (Daniel Kerr) from St Kilda in exchange for Gehrig.
Gehrig became a powerful and dominant force in the goalsquare and weighed in at 109 kilograms. He quickly became a prolific goalkicker, booting 55 goals in 2003 and 103 in 2004. A large pitch invasion by fans occurred following his 100th goal.
Gehrig won back-to-back Coleman Medals in 2004 and 2005 and was named at full-forward in the All-Australian team in 2004.
Gehrig's unique style of play earned him the nicknames "G-Train" for his locomotive-like leads and strong marking and "Carpet Snake" for his tendency to 'hide' behind the goal posts only to appear when the ball was heading his way. He has twice kicked 10 goals in a match in his AFL career; once against Richmond and once against the Kangaroos.
Gehrig was close to retirement at the end of the 2003 season but then coach, Grant Thomas, managed to convince him to play on. Gehrig signed a one-year deal at the end of the 2006 season and was again a prolific goal-kicker for the Saints, booting 59 goals from 20 matches.
After a few lacklustre games, many feared that Gehrig had lost his form and fitness and he was dropped to the reserves. In a last ditch effort to kickstart his playing the coach selected him in the senior list, but he failed to have any impact. Gehrig revealed that he was suffering from painful arthritis which affected his game and required surgery. St Kilda then put him on its long-term injury list. This move onto the long-term injury list, instead of retirement, meant that St Kilda were able to elevate Robert Eddy from the rookie list. Gehrig's subsequent return to the senior list was a precaution in case of injuries to other players but he has not since played again.

Gehrig was also charged with the unlawful assault of a woman in an alleged incident during Grand Final week in 2006. Gehrig, with Steven Lawrence and former Brisbane Lions captain Michael Voss, were all charged over a fight in a St Kilda hotel. 
Some of Gehrig's onfield incidents have earned him penalties, with the forward suspended for striking (once in the 2003, twice in 2004, once in 2005 and once in 2007).
In 2005 he was expelled from Thailand with a group of other footballers for undisclosed incidents.