Geoffrey David Cotter (born 4 October 1966) is a New Zealand rower.
Cotter was born in 1966 in Taihape, New Zealand.
He represented New Zealand at the 1988 Summer Olympics in the coxless four in a team with Campbell Clayton-Greene, Bill Coventry, and Neil Gibson, where they came seventh.
He is listed as New Zealand Olympian athlete number 542 by the New Zealand Olympic Committee.