Professional ratings
Review scores
Source	Rating
AllMusic
The A.V. Club	B–
Chicago Tribune
Entertainment Weekly	B–
Filter	93/100
Los Angeles Times
PopMatters	7/10
Q
Rolling Stone
Spin	7/10

Valleys of Neptune is a posthumous compilation album by American rock musician Jimi Hendrix. Released in the United States on March 9, 2010, the album boasts "12 previously unreleased studio recordings," including the title track, "one of the most sought after of all of Hendrix's commercially unavailable recordings."

The tracks on Valleys of Neptune were largely self-produced by Hendrix, and received extra posthumous production from Janie Hendrix, Eddie Kramer and John McDermott for Experience Hendrix, L.L.C. Recorded mostly in 1969 following the release of Electric Ladyland, the album predominantly features the original lineup of The Jimi Hendrix Experience: vocalist and guitarist Hendrix, bassist Noel Redding and drummer Mitch Mitchell. The lead single released from the album was "Valleys of Neptune", on February 1, 2010, followed by "Bleeding Heart" on March 1; music videos were produced for both songs.

The majority of the tracks featured on Valleys of Neptune were recorded in early 1969, while Hendrix was experimenting with songs for his unfinished fourth album, following the successful release of Electric Ladyland in September 1968. Numerous versions have been released, both officially and otherwise, and the majority of the 'previously unreleased' recordings present on the 2010 album have been released in one form or another before, albeit sometimes in inferior quality or different versions.

The album artwork is based on a painting by Hendrix himself in 1957. "He went through a phase doing watercolors at school and this was one of the 110 drawings of his that our father kept. When I saw this one he did in 1957, it screamed 'Valleys of Neptune' to me so we knew we'd use it for this project," said his step-sister, Janie. The album artwork is a mix of his painting and a Linda McCartney photograph of him with a blue tint.

Valleys of Neptune received generally positive reviews from critics. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream publications, it received an average score of 68, based on 15 reviews. In Rolling Stone, critic Will Hermes found the music beautiful and exciting, while writing, "Are these tracks 'finished' as Hendrix would've intended? Probably not. But as a glimpse of the guitarist extending his reach beyond the Experience trio, it's thrilling.".Greg Kot, writing for the Chicago Tribune, called it "a sharp snapshot of a musical genius in the studio during a period of transition". Ludovic Hunter-Tilney from the Financial Times called the album "a cut above the many posthumous cash-ins released in [Hendrix's] name."

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