The eighth season of the American television comedy series How I Met Your Mother was announced in March 2011 along with confirmation of the seventh season. The season premiered on September 24, 2012 and concluded on May 13, 2013.

The ninth and final season of How I Met Your Mother, an American sitcom created by Carter Bays and Craig Thomas, premiered on CBS on September 23, 2013, with two episodes, and concluded on March 31, 2014. The show was renewed for the final season on December 21, 2012, after cast member Jason Segel changed his decision to leave the show after Season 8. Cristin Milioti, who was revealed as "The Mother" in the Season 8 finale, was promoted to a series regular, the only time How I Met Your Mother added a new regular cast member. Season 9 consists of 24 episodes, each running approximately 22 minutes in length.