Television:
* American Idol (2003): He was the runner-up in the second season of this popular singing competition. This launched his career.
* The Biggest Loser (2012): He was a contestant on this weight loss competition show.
* The Celebrity Apprentice (2014): He appeared on this reality series, ultimately winning the competition.
* The View (2012-2013): Aiken was a co-host for a season on this daytime talk show.
* Spanglish (2004): He had a small role in this movie as himself.
* The Naked Brothers Band (2007): He appeared as a guest star in an episode of this Nickelodeon show.
* RuPaul's Drag Race (2019): He made a guest appearance on this reality competition show.
Films:
* The 25th Annual Putnam County Spelling Bee (2002): He played the role of Leaf Coneybear in this film adaptation of the Broadway musical.
* Spanglish (2004): He had a small role in this movie as himself.
* Christmas in Love (2022): He starred as the lead male role in this Hallmark Christmas movie.
Theatre:
Clay Aiken has been involved in various stage productions, including:
* The 25th Annual Putnam County Spelling Bee: He has played the role of Leaf Coneybear in this musical multiple times, both on and off Broadway.
* Joseph and the Amazing Technicolor Dreamcoat: He starred as Joseph in a national tour of this popular musical.
* Grease: He played the role of Kenickie in a production of this musical.
* Hairspray: He played the role of Edna Turnblad in a production of this musical.
It is worth noting that Aiken's primary focus has always been on his musical career. He has released multiple albums and has continued to perform live concerts throughout his career. He has also been active in politics, running for Congress in 2014.