The tenth season of the American sitcom The Big Bang Theory aired on CBS from September 19, 2016 to May 11, 2017. The series returned to its regular Thursday night time slot on October 27, 2016 after Thursday Night Football on CBS ended.

The ninth season of the American sitcom The Big Bang Theory aired on CBS from September 21, 2015 to May 12, 2016. The series returned to its regular Thursday night time slot on November 5, 2015 beginning with the season's seventh episode. On March 12, 2014, The Big Bang Theory was renewed for an additional three years, extending it through the 2016–17 television season for a total of ten seasons. Laura Spencer was promoted to the main cast during this season after being a recurring cast member for two seasons.