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River: The Joni Letters is a 2007 album by jazz pianist Herbie Hancock. It is a tribute album, featuring covers of songs originally written and performed by singer-songwriter Joni Mitchell. It is Hancock's 47th studio album. It was released on September 25, 2007 by Verve Records.

Hancock is a longtime friend of Mitchell's, and both he and saxophonist Wayne Shorter, who plays throughout the album, had previously collaborated with Mitchell on her 1979 album Mingus, and both continued to work with her on occasion ever since.

Guest vocalists on River include Leonard Cohen, Tina Turner, Norah Jones, Corinne Bailey Rae, Luciana Souza and Mitchell herself.

The album won the Grammy Award for Album of the Year in 2008. It peaked at #5 on the Billboard 200 after enjoying a huge post-Grammy sales boost, at #61 in Switzerland, #70 in France and #83 in the Netherlands.

On February 10, 2008, the album won the Album of the Year and Best Contemporary Jazz Album at the 50th Annual Grammy Awards. The Album of the Year award surprised the music world; Hancock had faced competition from major-selling artists Kanye West, Foo Fighters, Amy Winehouse, and Vince Gill.River was only the second jazz album to win Album of the Year in the award's history, the first being Getz/Gilberto by Stan Getz and João Gilberto in 1965. The track "Both Sides Now" was also nominated for Best Jazz Instrumental.

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