"I'm Glad" is a song recorded by American entertainer Jennifer Lopez for her third studio album, This Is Me... Then (2002). It was written by Lopez, Troy Oliver, Cory Rooney, Mr. Deyo and Jesse Weaver Jr. and produced by Oliver and Rooney. It was released as the album's third single on April 8, 2003.

Lopez's third studio album This Is Me... Then was released in November 2002. It featured the entertainer in a more "hands-on role" than ever before, writing more material. Her fiancé at the time, actor Ben Affleck, was her muse and inspiration for the album's lyrics; the title referred to "who you are at the time", and it was something Lopez wanted to look back on in the future. Affleck and Lopez became a prominent supercouple in popular culture, referred to as "Bennifer" by the public. "Jenny from the Block" was released as the album's lead single, peaking at number three on the US Billboard Hot 100, while its second single "All I Have", topped the Hot 100. However, Lopez was initially dissatisfied with the release of both singles. She felt that the tracks were too similar to her previous singles such as "Ain't It Funny" and "I'm Real"; she felt like she was "visiting old territory". She subsequently released "I'm Glad" as the album's third single, with it being serviced to Top 40 radio on April 8, 2003.

"I'm Glad" is an uptempo R&B ballad which runs for a duration of three minutes and forty-two seconds. Lopez wrote the song with the assistance of Troy Oliver, Cory Rooney, Andre Deyo and Schooly D, with Oliver and Rooney serving as producers. She recorded her vocals for the track with Peter Wade Keusch and Bruce Swedien at The Hit Factory recording studios in New York City, where it was also mixed. "I'm Glad" contains a sample of the 1986 Schooly D song "P.S.K. What Does It Mean?". Its instrumentation consists of classical harp runs laced throughout a computer-generated beat. Written in the key of Db Major, Lopez's vocal spans from an A₃ to a C₅. Its instrumentation includes the use of piano and guitar. "I'm Glad" is about finding true love, containing lyrics such as "I think I'm in love. Damn, finally".The Boston Globe noted the song's lyrics to be about her relationship with actor Ben Affleck, who served as Lopez's muse for This Is Me... Then.

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