Keith Theodore Olbermann (born January 27, 1959) is an American news anchor, sportscaster, writer, and political commentator. He hosts Countdown with Keith Olbermann, an hour-long nightly news and commentary program on MSNBC. Starting with the 2007 NFL season, Olbermann also has served as a co-host of NBC's Football Night in America.

Olbermann spent the first twenty years of his career in sports journalism. He was a sports correspondent for CNN in the 1980s, winning the Best Sportscaster award from the California Associated Press three times. He later co-hosted ESPN's SportsCenter from 1992 to 1997. After leaving ESPN amid controversy, Olbermann became a sports anchor and producer for Fox Sports Net from 1998 to 2001, during which time he hosted FOX's studio coverage of baseball.

After leaving Fox, Olbermann re-joined MSNBC after a short hiatus, hosting Countdown with Keith Olbermann in 2003. Olbermann has established a niche in cable news commentary, gaining prominence for his pointed criticism of major politicians and public figures, directed particularly at the political right. He has feuded with rival commentator Bill O'Reilly, and strongly criticized the George W. Bush administration and John McCain's unsuccessful 2008 Presidential candidacy. Although Olbermann's political views have been described as leaning to the left, he has said on at least one occasion "I'm not a liberal, I'm an American."