The eleventh season of the American television sitcom The Big Bang Theory aired on CBS from September 25, 2017 to May 10, 2018. The series returned to its regular Thursday night time slot on November 2, 2017, after Thursday Night Football on CBS ended.
In March 2017, CBS renewed the series for two additional seasons, bringing its total to twelve and securing that the series would run through the 2018–19 television season.