Season 0 of Who Do You Think You Are? premiered on July 11, 2007.

Season 1 of Who Do You Think You Are? premiered on October 12, 2004.

Season 2 of Who Do You Think You Are? premiered on January 11, 2006.

Season 3 of Who Do You Think You Are? premiered on September 6, 2006.

Season 4 of Who Do You Think You Are? premiered on September 6, 2007.

Season 5 of Who Do You Think You Are? premiered on August 14, 2008.

Season 6 of Who Do You Think You Are? premiered on February 2, 2009.

Season 7 of Who Do You Think You Are? premiered on July 19, 2010.

Season 8 of Who Do You Think You Are? premiered on August 10, 2011.

Season 9 of Who Do You Think You Are? premiered on August 15, 2012.

Season 10 of Who Do You Think You Are? premiered on July 24, 2013.

Season 11 of Who Do You Think You Are? premiered on August 7, 2014.

Season 12 of Who Do You Think You Are? premiered on August 13, 2015.

Season 13 of Who Do You Think You Are? premiered on November 24, 2016.

Season 14 of Who Do You Think You Are? premiered on July 6, 2017.

Season 15 of Who Do You Think You Are? premiered on June 6, 2018.

Season 16 of Who Do You Think You Are? premiered on July 22, 2019.

Sixteenth series of the BAFTA-winning series

Season 17 of Who Do You Think You Are? premiered on October 12, 2020.

Season 18 of Who Do You Think You Are? premiered on October 12, 2021.

Season 19 of Who Do You Think You Are? premiered on May 26, 2022.

Season 20 of Who Do You Think You Are? premiered on June 1, 2023.