The eighth season of Will & Grace premiered with a live episode on September 29, 2005 and concluded on May 18, 2006, consisting of 24 episodes. The eighth season was the final season of the series' original run; the ninth season and series revival premiered on September 28, 2017.

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.