The ninth season of the American comedy series Will & Grace premiered on September 28, 2017. It comprised 16 episodes, and is the first of three reunion seasons following the series' eighth season in 2006. The season concluded on April 5, 2018.

Will & Grace is an American television sitcom created by Max Mutchnick and David Kohan. Set in New York City, the show focuses on the friendship between best friends Will Truman, a gay lawyer, and Grace Adler, a straight interior designer. The show was originally broadcast on NBC from September 21, 1998, to May 18, 2006, for a total of eight seasons, and returned to NBC on September 28, 2017, and permanently ended on April 23, 2020. Will & Grace has been one of the most successful television series with gay principal characters.