Operation: Doomsday is the debut studio album by rapper MF DOOM, released through Fondle Em' Records on 19 October 1999 and reissued by Sub Verse Records in 2001 with a slightly altered track listing. It was his first solo release under the MF DOOM moniker after previously performing as Zev Love X in the group KMD. Operation: Doomsday is regarded as one of the most influential albums in independent hip-hop history. A deluxe remastered version of the album was released by Doom's own Metal Face Records on 24 October 2011.

Tracklist:

A1 The Time We Faced Doom (Skit) 2:04 A2 Doomsday 4:58

A3 Rhymes Like Dimes* 4:18

A4 The Finest 4:01

A5 Back In The Days (Skit) 0:45

B1 Go With The Flow 3:36

B2 Tick, Tick...  4:04

B3 Red And Gold 4:42

B4 The Hands Of Doom (Skit) 1:50

B5 Who You Think I Am? 3:24

C1 Doom, Are You Awake? (Skit) 1:12

C2 Hey! 3:46

C3 Operation: Greenbacks 3:46

C4 The Mic 3:02

C5 The Mystery Of Doom (Skit) 0:21 

D1 Dead Bent 2:22

D2 Gas Drawls 3:43

D3 ? 3:33

D4 I Hear Voices (Part One) 2:59