The eleventh season of the American television sitcom The Big Bang Theory aired on CBS from September 25, 2017 to May 10, 2018.

[2] 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.

Filming for the eleventh season began on August 15, 2017; it was also announced with the taping report that the premiere for the eleventh season would be titled "The Proposal Proposal".

Before the season premiered, five episodes were filmed from August 15 to September 19, 2017.

[4] According to TV Guide, Steve Holland announced on September 22, 2017, that both Bob Newhart and Wil Wheaton would return this season after their absences during Season 10.