Geoffrey Peter "Geoff" Vanderstock (born October 8, 1946) is an American track and field athlete primarily known for running hurdles.

His 48.94 was set at the high altitude United States Olympic Trials at Echo Summit, California, on September 11, 1968.

[3] At the Golden West Invitational, the equivalent of a National High School Championship meet, he tied for 3rd in 120y HH in 14.2 and was also 3rd in the 180y LH in 19.0.

SAC, he also joined future pole vault gold medalist Bob Seagren in setting the national junior college record in the shuttle hurdles relay.

[5] He then went to the University of Southern California, finishing third in the 1968 NCAA Men's Outdoor Track and Field Championships[6] and was a two time All-American[7] He was ranked in the top ten American 400 metre hurdlers 5 straight years 1965-1969, including two years, 1966 and 1968 ranked as number one.