"I'm with You" is a song by 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 four on the U.S. Billboard Hot 100 (Lavigne's third single to reach the top ten), number five in New Zealand, number seven in the United Kingdom and number 18 in Canada. "I'm with You" received radio and television airplay in Australia, but it was not officially released there.

"I'm with You" became Lavigne's third top 10 song when it peaked at #4 on Billboard Hot 100 in 2003 during its ninth week on the chart. The song spent ten consecutive weeks on the top 10 and twenty-seven weeks on the Hot 100 making it Lavigne's second-longest staying song on this chart, surpassed by her debut single "Complicated" which stayed on the chart for 31 weeks. "I'm with You" ranked at #18 on the Billboard Year-End Hot 100 singles of 2003 and #13 on the Canadian Singles Chart. The song was certified gold by Recording Industry Association of America in 2006 for sales of over 500,000 copies in the United States. As of July 2013, I'm with You had sold 556,000 digital copies in the US. As a double-A-side DVD single, the "I'm with You"/"Sk8er Boi" video single was certified gold and platinum in 2003.

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