Guy Andrew Cosmo (born 12 March 1977 in Port Jefferson, NY) is an American racing driver who competes in the United SportsCar Championship. He is a former American Le Mans Series Rookie-of-the-Year winner who claimed four wins and multiple podium finishes in ALMS competition.

Cosmo's career began in go-karts at the age of 11, earning championships in karting, Formula Ford, F2000 and Star Mazda prior to a limited season in Toyota Atlantic Championship competition. He earned four top-10 finishes in four starts in Atlantics prior to being chosen as a development driver for the new Star Mazda Pro Formula Car.

Cosmo made his Rolex Sports Car Series and Continental Tire Sports Car Challenge debuts in 2003, scoring three podium finishes in five starts with Cegwa Sport and G&W Motorsports. He earned two victories in two starts in the CTSC STI class in 2003.

In 2006, Cosmo competed in a limited-season with Playboy/Uniden Racing and Spirit of Daytona Racing, earning a season-high second-place result at Miller Motorsports Park and helping take Playboy/Uniden Racing to a fourth-place finish in the DP points standings.

The 2007 season saw Cosmo compete for a variety of teams, including Doran Racing, Blackforest Motorsports, Brumos Racing, Southard Motorsports and Spirit of Daytona Racing, while also enjoying success in CTSC with one victory and two podium finishes in Fountain Motorsports' BMW 330i.

Cosmo competed in the majority of the 2008 and 2009 seasons with Spirit of Daytona Racing, as part of the team's development program with its Lozano Brothers-tuned Porsche Cayenne V8 engine.

He rejoined BGB Motorsports in 2008 and raced with the team in CTSC competition through 2011, before making several Rolex Series starts in Extreme Speed Motorsports' Ferrari 458 Italia Grand Am in 2012.

Cosmo made his ALMS debut in 2003 with a 9th-place finish at the 12 Hours of Sebring in American Spirit Racing's Riley & Scott MKIIIC.