The Indianapolis Colts own the longest winning streak in NFL history - 23 games. The streak began on November 2, 2008 with a victory over the New England Patriots and continued until a loss to the New York Jets on December 27, 2009. This game also ending the Colts' chance at an undefeated season, but the Colts did go on to win the AFC Championship (17-30) verses the Jets.
Note: The NFL excludes exhibition games and playoff games from their official statistics.
The 1972 Miami Dolphins, the first team in NFL history to go through a single season undefeated and the only team to have a perfect season including a Super Bowl victory, lost their second game of the 1973 regular season and wound up with a winning streak of 18 games.
In 2008, the longest winning streak for the Seattle Mariners was four games. It ran from August 29th through September 1st.
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The Boston Bruins' longest streak was 14 games from December 3, 1929 to January 9, 1930
Their longest streak of not winning the World Series is 24 years, from 1982 to 2006.
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Alabama
BYU currently holds the longest home game winning streak in college football with 18 wins
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In the Washington/Oregon rivalry, Washington's longest winning streak is 6 games (1981-1986, 1974-1979, 1955-1960, 1908-1909 and 1911-1914) and Oregon's longest winning streak is 7 games (2004-2010).
Boise State University with 24 wins
23 games, by Geelong 1952-1953
Clairton bears at 47 wins