U.f.orb - Orb (the) - 1992
Released by Big life
Tracks : 7 / Length : 74:01:30

Under the sun - Mark pritchard - 2016
Released by Warp
Tracks : 16 / Length : 67:27.23
digipack

Untilted - Autechre - 2005
Released by Warp
Tracks : 8 / Length : 69:52:56

Up in flames - Manitoba - 2003
Released by Leaf
Tracks : 10 - 6 / Length : 39:07:00 - 27:36:36
'special edition'
Cd2 contains two videos

Urmur bile trax volume 1 volume 2 - µ-ziq - 1997
Released by Virgin
Tracks : 8 / Length : 67:51:55

Utopía - Murcof - 2004
Released by Leaf
Tracks : 11 / Length : 75:43:59
digipack, ep
unreleased, vynil only and remixes