"Complicated" is a song by Avril Lavigne and was her first single, released in 2002 from her debut album, Let Go. It was written by Lavigne and The Matrix (Scott Spock, Lauren Christy, and Graham Edwards), and produced by The Matrix. The single reached number two on the United States Billboard Hot 100, number three in the United Kingdom and number one in Australia, Norway and Mexico. Based on its chart performance, the song is Lavigne's second most successful single and was one of the most successful releases of 2002.

The song was ranked at number 197 in Blender magazine's "The 500 Greatest Songs Since You Were Born". It has a parody by "Weird Al" Yankovic called "A Complicated Song". It is featured on the video game Karaoke Revolution. Complicated was the biggest hit of 2002.

Track listings

Default CD single (UK, Canada, Mexico)

1. "Complicated" (Tom Lord-Alge mix)
2. "I Don't Give"
3. "Why"
4. "Complicated" (music video)

Australian CD single

1. "Complicated" (The Matrix mix)
2. "I Don't Give"
3. "Why"

Brazilian promo

1. "Complicated"
2. "Complicated" (Tom Lord-Alge mix)
3. "Complicated" (The Matrix mix)

UK/Mexico promo

1. "Complicated"

Japan/U.S./France/Italy/Netherlands single

1. "Complicated"
2. "I Don't Give"

Music video

Awards

The Canadian single of "Complicated" has shipped over 100,000 copies in Canada, where the song has been awarded the gold and platinum single certifications by the CRIA for, respectively, shipments of at least 50,000 and 100,000 singles shipped. Lavigne won Best New Artist at the 2002 MTV Video Music Awards for "Complicated". "Complicated" won in the Single of the Year category at the 2003 Juno Awards. In the United States, the song was nominated at the 2003 Grammy Awards for Best Female Pop Vocal Performance and Song of the Year; it lost both awards to Norah Jones's "Don't Know Why".