"Valleys of Neptune" is a song by American rock musician Jimi Hendrix, featured on his 2010 posthumous studio album Valleys of Neptune. Written and produced by Hendrix, the song was originally recorded between 1969 and 1970.

Hendrix began work on the musical composition for "Valleys of Neptune", under the title of "Gypsy Blood", in February 1969, with the first recordings taking place at Olympic Sound Studios in London on February 22 & 26, 1969 – three takes on guitar and piano and one take on guitar, respectively. Hendrix wrote the lyrics for the song under the title of "Valleys of Neptune... Arising" on June 7, 1969, while staying at the Beverly Rodeo Hotel in Beverly Hills, California. Bassist Noel Redding left [tThe Jimi Hendrix Experience]] following a show on June 29, 1969, in Denver, Colorado, at which point Hendrix began to form a new band to continue work on his new compositions.

During and following the formation of The Jimi Hendrix Experience successor Gypsy Sun and Rainbows, "Valleys of Neptune" began to take more shape, and the first full-band recording of the song took place on September 6, 1969 at the Hit Factory in New York City.

A few weeks later, on September 23, 1969, the first master recording of "Valleys of Neptune" was recorded at New York City's Record Plant Studios with bassist Billy Cox, drummer Mitch Mitchell (later stated by Hendrix and his management as the Experience in 1970) and percussionist Juma Sultan, in addition to seven instrumental takes of the track. Another full take was completed a week later, featuring Hendrix on bass with Stephen Stills on guitar and piano, John Sebastian on guitar and Buddy Miles on drums.

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