"I'm Yours" is a song written and recorded by American singer-songwriter Jason Mraz, released in 2008 as the first single from his third studio album We Sing. We Dance. We Steal Things.. The song was originally released on a limited edition EP called Extra Credit as a demo in 2005 to promote his second studio album Mr. A–Z. It was performed in his 2004 and 2005 gigs and already became a crowd favorite before its release. "I'm Yours" was nominated for Song of the Year and Best Male Pop Vocal Performance at the 51st Grammy Awards.

"I'm Yours" was a huge commercial success in the United States. The song peaked at number 6 on the Billboard Hot 100; and spent 76 weeks on the chart, breaking the record for the longest charting song on the chart, previously held by LeAnn Rimes' song "How Do I Live" with 69 weeks on the chart; this record has since been broken and is currently held by "Heat Waves" by Glass Animals, which has spent 91 weeks on the chart. As of January 2013, it is the tenth best-selling digital song of all time in the US, selling over 6 million downloads, and 12.2 million worldwide. In July 2021, it surpassed 1 billion streams on Spotify. It remains Mraz's biggest US hit single to date. It was the only song to crack Billboard's top 600 of all time chart despite never cracking the top 5.

Mraz first launched the song from the La Costa Resort and Spa in Carlsbad, California, at Michele Clark's Sunset Sessions in 2008. He also sang a version on Sesame Street titled "Outdoors" and released a successful remixed version featuring Lil Wayne and Jah Cure.