I'm including albums that WERE my favourite albums at some point in my life too, unless i REALLY hate them now so I expect a lot of criticism but here goes:

Hope of The States - The Lost Riots
Black Sabbath - Vol.4
The Smiths - S/T (but I can barely choose one to standout)
The Manic Street Preachers - The Holy Bible
The Stooges - Fun House
Oasis - Definitely Maybe
Metallica - Kill Em All
Jeff Buckley - Grace
Electric Wizard - Dopethrone
Rage Against The Machine - S/T
The Who - Tommy
At The Gates - Terminal Spirit Disease
Altar - Sunn O)))/Boris split/colab
QOTSA - S/T
Entombed - Left Hand Path
Evoken - Shades of Night Descending
The Stone Roses - S/T
Opeth - Damnation
The Music - S/T
The Raveonettes - Whip It On
Joe Satriani - Crystal Planet
Stereophonics - Word Gets Around (when i was about 16, included for nostalgic reasons)
Helmet - Meantime
Iron Maiden - Seventh Son
Muse - Origin Of Symmetry
The Cooper Temple Clause - See This Through and Leave
Coldplay - Rush Of Blood To The Head
Stevie Ray Vaughan - Texas Flood
The Strokes - Is This It? (same as The Phonics really, included more for nostalgic reasons. Sounds lazier every time I listen to it but I still like it.)
Pentagram - Relentless
Possessed - Seven Churches
Witchfinder General - Death Penalty
Loop - Wolf Flow (if this can really count)