Juan Guillermo Brunetta (born August 25, 1975, in Laboulaye, Córdoba) is an Argentine professional racing cyclist.

Like most cyclists out of Córdoba, he started off as a track rider but has made the transition to the road and does not race as much on the track these days.

He has been one of the best time trialists for the last 6 years in Argentina, but he has raced most of his road career in Uruguay with the Villa Teresa team with much success, especially in the time trials.

He competed in the men's team pursuit at the 2000 Summer Olympics.

This biographical article relating to Argentine cycling is a stub.