"I'm with You" is a song by Franco-Canadian singer-songwriter Avril Lavigne for her debut album, Let Go. It was released on November 19, 2002 by Arista Records as the album's third single. The song was Lavigne's first ballad released as a single. It was the second Lavigne song to be nominated for a Grammy in the categories Song of the Year and Best Female Pop Vocal Performance at the 2004 Grammy Awards.
The song reached number one in Mexico, number four on the U.S. Billboard Hot 100 (Lavigne's third single to reach the top ten), number seven in the United Kingdom and number 13 in Canada. "I'm with You" received radio and television airplay in Australia, but it was not officially released there.