I kept the same criteria as Requiem: one album per band, otherwise it would likely be dominated by two bands. And I use 'gothic' as a descriptor rather than the common genre definition. I provided some brief notes for each album. This is only a rough idea of my top ten as it is hard to include only ten.
Theatres des Vampires - Bloody Lunatic Asylum
An absolute masterpiece. TdV really had something special going on in the late 90s/early 00s before they changed their direction and split with their vocalist.
Cradle of Filth - The Principle of Evil Made Flesh
It's brutal, ugly, and utterly atmospheric in its funereal gloom. One of many masterpieces that the band has released.
Darkness of Blood - A Dream of Vampires in Astral Dementia
It doesn't get any more vampiric than this obscure masterpiece, trust me. This is a blood overdose.
My Dying Bride - As the Flower Withers
Whist essentially being a death metal album, it does display some gothic touches here and there. Some of their later albums may wear the descriptor better but, nevertheless, this is my personal favourite of theirs.
Dimmu Borgir - Spiritual Black Dimensions
I normally wouldn't refer to Dimmu Borgir as gothic but this particular album is. I think this was due to the changes in line-up and it's no surprise that it is very similar to Mirrored Hate Painting, only more majestic.
Moonspell - Wolfheart
I have a difficult time choosing between this and Irreligious but I think I prefer Wolfheart stylistically.
Deinonychus - The Weeping of a Thousand Years
An anomaly amid their catalogue, Deinonychus decided to fully immerse themselves in gothic atmospheres on this album.
Evenfall - Still in the Grey Dying
Excellent album, similar to early Theatres des Vampires.
Anathema - The Silent Enigma
Excellent album, more engaging than their debut. I prefer earlier Anathema over their later stuff.
Paradise Lost - Icon
I am not entirely sure this is my favourite of theirs but Icon, along with Gothic and Draconian Times, represents Paradise Lost at their best.