Bob Costas is an American sportscaster who is known for his long tenure with NBC Sports, from 1980 through 2019. He has received 28 Emmy awards for his work and was the prime-time host of 12 Olympic Games from 1992 until 2016. He is employed by MLB Network, where he does play-by-play and once hosted an interview show called Studio 42 with Bob Costas.

Costas has also hosted NBC's coverage of the U.S. Open golf tournament from 2003 to 2014

From 2001 until 2018, Costas co-hosted the Kentucky Derby.

Costas hosted Later with Bob Costas on NBC from 1988 until 1994. He decided to leave Later after six seasons, having grown tired of the commute to New York City from his home in St. Louis and wishing to lighten his workload in order to spend more time with his family. He also turned down an offer from David Letterman, who moved to CBS in 1995, to follow him there and become the first host of The Late Late Show, which was being developed by Letterman's company to air at 12:30 after the Late Show with David Letterman.