Glenn Weiner (born April 27, 1976) is a former professional tennis player from the United States.

Weiner won his first match on the ATP Tour in 1997, at the Infiniti Open, where he defeated Bob Bryan.

Despite being ranked 280th in the world coming into the tournament, Weiner came close to beating the previous year's Wimbledon winner, Richard Krajicek, in the second round.

[1] Just weeks later, Weiner upset world number 36 Thomas Johansson at Indianapolis.

[2] He defeated countryman Jeff Salzenstein in the 2004 Australian Open, the only time he reached the second round of a Grand Slam singles draw.