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The Half-Life: Opposing Force soundtrack was composed by Chris Jensen; it was reused for the Half-Life: Blue Shift soundtrack.

Many of the original tracks had no name on the Opposing Force disc, but received one on the Blue Shift disc. Additionally, most previously named tracks received a new name on the Blue Shift disc as well. When a track has multiple titles, the Opposing Force title is listed first.

Track list[]

# Title Location played
1 “Scientific Proof” Incoming: Played during the opening scene aboard the Osprey.
2 “The Awakening AKA Orbit” Welcome to Black Mesa: Upon exiting the Black Mesa Infirmary
3 “Name” Welcome to Black Mesa: Upon encountering the Vortigaunt corpse with the Combat Knife impaled in its back
4 “Spooky Oozings AKA Listen” Welcome to Black Mesa: Upon falling into the pool of water immediately after entering the sewers of the Black Mesa Transit System.
5 “Spooky Monastery” "We Are Pulling Out": While riding the tram.
6 “Storm” "We Are Pulling Out": While running up to the hangar access door that The G-Man closes.
7 “Spectre of Limbo AKA Trample” "Missing In Action": While Approaching the Test Flame Area
8 “Race from Doom 2 AKA Bust” Friendly Fire: While approaching the room where Adrian first encounters the Black Ops.
9 “Temple of Limbo AKA The Beginning” Crush Depth: While entering the lift right before rescuing the Scientist in the teleporter at the beginning of the chapter.
10 “Wastes of Limbo AKA Lost in Thought Crush Depth: The room with the broken X-ray, immediately before Adrian's first encounter with Shock Troopers.
11 “Danger Rises” We Are Not Alone: Upon entering Xen for the first time.
12 “Soothing Antagonist” Foxtrot Uniform: When approaching the Dam.
13 “Stroke of Midnight AKA Run” Pit Worm's Nest: Upon dropping from the air vent at the beginning of the chapter.
14 “Open the Valve” Vicarious Reality: When Shock Troopers and Pit Drones teleport into the Observation Area of Biodome 02.
15 “Tunnel” Foxtrot Uniform: Upon entering the sewer maze populated by Voltigores.
16 “The Ticking Timebomb AKA Chamber” "The Package": Upon approaching the Black Ops Mortar.
17 “Maze” "The Package": Riding the lift leading to the start of Worlds Collide
18 "Alien Forces" Worlds Collide: While riding down the lift to the battle with the Gene Worm.
19 “Planet” This is the song played over the final credits.