Boy
October
War
Under A Blood Red Sky (Live Album)
The Unforgettable Fire
Wide Awake In America (EP)
The Joshua Tree
Rattle And Hum
Achtung Baby
Zooropa
Passengers (Brian Eno/U2 and others)
Pop
All That You Can't Leave Behind
How To Dismantle An Atomic Bomb
(I think that's it, unless my brain isnt working at the mo...)
I don't know if Passengers can be called a U2 album. As Aardvark said it includes Brian Eno and others. The correct title of the album is "Original Soundtracks Vol I" by Passengers, i.e. they renamed themselves "Passengers" for the album. Also I wouldn't consider Million Dollar Hotel Soundtrack a U2 album.