"This Is It" is a song by American musician Kenny Loggins. It was released in 1979 as the lead single from his 1979 album Keep the Fire. It reached number 11 on the Billboard Hot 100 and number 17 on the Adult Contemporary chart. "This Is It" was also successful on the Hot Soul Singles chart, reaching number 19, it was one of two entries on this chart.

The song features additional vocals by Michael McDonald, who co-wrote the song with Loggins. The song won a Grammy Award in 1981 for Best Pop Vocal Performance, Male.

At one point in the song's evolution, its melody was underway, but the lyrics were incomplete. Loggins moved it forward after a visit to his ailing father, who had undergone a series of surgeries for vascular problems stemming from small strokes and was discouraged at the prospect of another. His perspective on the lyrics then changed: "'I've got it,' I announced to Michael, it's not a love song. It's a life song."

NBC used the song as theme music for its coverage of the NCAA men's basketball tournament in 1980 and 1981.

The song was sampled for Nas' song, "We Will Survive" from his third studio album, I Am...

It appears in the 2013 film Anchorman 2: The Legend Continues.

It appears on "America's Game: The Super Bowl Champions" episode: the 1981 49ers on NFL Network in 2007.

Josh Kaufman, a contestant sang the song on "The Voice"

WPVI-TV (Philadelphia) used this song as the theme for the WPVI original program of the same name

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