Book of Days is the eleventh studio album by the progressive rock band Nektar, released in 2008.

It saw the departure of founding keyboardist Alan "Taff" Freeman, leaving only two original band members in guitarist/frontman Roye Albrighton and drummer Ron Howden.

[1] For the deluxe release, Albrighton's solo album The Follies of Rupert Treacle was included.

[2] All tracks are written by Roye Albrighton