Blue Sphere is an instrumental jazz composition by Thelonious Monk, and it has no lyrics. Monk recorded it on 15 November 1971, and the recording was first released on the album Something in Blue, issued by Black Lion Records and dated 1972 in some listings. On that release the tune is track A1, placing it at the opening of the album's first side. The album master is classified under the jazz style bop.
Later versions have been recorded by other musicians. Among them are recordings by Dario Germani, dated 2015, Gregory Lewis, dated 2017, and Marco Fumo, dated 2025. The available information describes the tune as a composition for instrumental performance, and no further details about its form, key or arrangement are documented.
