In the 2015 regular season, the New England Patriots lost to the following teams:
Denver Broncos (ot)
New York Jets (ot)
Miami Dolphins
In the Playoffs, the Patriots lost to the Denver Broncos in the AFC Championship game.
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The New England Patriots lost to the New York Jets on Sept 19th with a score of 28 to 14. Then the Patriots lost to Cleveland 34 to 14 on November 7th. Those are the only 2 games they lost during regular season in 2010-2011.