Alison Sydor (born September 9, 1966) is a retired Canadian professional cross country mountain cyclist. She began cycling at age 20 and is a graduate of the University of Victoria. She won a silver medal at the 1996 Summer Olympics in mountain bike, and has won 3 world mountain bike championships gold medals (1994 in Vail, Colorado; 1995 in Kirchzarten, Germany; 1996 in Cairns, Australia; and the 2002 relay race in Kaprun, Austria.)
Sydor has also won five silver medals (1992, 1999, 2000, 2001 and 2003) and three bronze (1998, 1999 (relay race), 2004) at mountain bike world championships, and one bronze at the road world championships (1991). In addition, Sydor has won 17 World Cup (cross-country) races in her career, and for 13 consecutive years (1992–2004) never finished outside of the top-5 at the world championships.
In 1995 and 1996, Sydor was awarded the Velma Springstead Trophy as Canada's top female athlete.
In September 2007 Sydor was inducted into the Mountain Bike Hall of Fame
In December 2007 it was publicly announced that Sydor will be inducted into British Columbia Sports Hall of Fame Class of 2008 at a ceremony on May 29, 2008.
In 2013, Sydor was inducted into Canada's Sports Hall of Fame.