Side Missions in Mass Effect 3 serve as the game's optional quests. Side Missions do not advance the main story and are not required to complete the game. However, completing them can offer context and backstory that help the player understand the inner workings of the game's universe and the interactions between its various Races. Side Missions are also a good source of additional experience, loot, as well as War Assets which are an important resource that tie into your Galactic Readiness Rating and can affect the outcome of the main campaign's final battle.
Note that several Side Missions are progress-sensitive and become unavailable for the rest of the game after certain conditions are met, usually after completing specific Main Missions from the campaign. These will be detailed on the individual Side Mission page, as well as any related Main Mission pages.
All Side Missions in Mass Effect 3
N7 Missions
Citadel Missions
- Citadel: Alien Medi-Gel Formula
- Citadel: Asari Widow
- Citadel: Barla Von
- Citadel: Batarian Codes
- Citadel: Biotic Amp Interfaces
- Citadel: Cerberus Automated Turret Schematics
- Citadel: Cerberus Ciphers
- Citadel: Cerberus Retribution
- Citadel: Cerberus Turian Poison
- Citadel: Chemical Treatment
- Citadel: GX12 Thermal Pipe
- Citadel: Hanar Diplomat
- Citadel: Heating Unit Stabilizers
- Citadel: Improved Power Grid
- Citadel: Inspirational Stories
- Citadel: Kaklisaur Fossil
- Citadel: Krogan Dying Message
- Citadel: Medical Supplies
- Citadel: Medi-Gel Sabotage
- Citadel: Reaper Code Fragments
- Citadel: Target Jamming Technology
- Citadel: Volus Ambassador
- Citadel: Wounded Batarian
Others
- Hades Nexus: Prothean Sphere
- Ismar Frontier: Prototype Components
- Irune: Book of Plenix
- Mesana: Distress Signal
- Kallini: Ardat-Yakshi Monastery
- Kite's Nest: Pillars of Strength
- Nimbus Cluster: Library of Asha
- Shrike Abyssal: Prothean Obelisk
- Silean Nebula: Rings of Alune
- Tuchanka: Bomb
- Valhallan Threshold: Prothean Data Drives
Downloadable Content Missions
From Ashes DLC
Omega DLC
Citadel DLC
- Citadel: Shore Leave
- Citadel Wards: Ambush
- Citadel: Identity Theft I
- Silver Coast Casino: Infiltration
- Citadel: Identity Theft II
- Citadel Archives: Escape
- Citadel Docks: Retake the Normandy
- Citadel: Party
- Citadel Arena: Geth Challenge
- Citadel Arena: Spin Zone Elite Challenge
- Citadel Arena: Medi-Gel Challenge
- Citadel Arena: Reaper Solo Challenge
- Citadel Arena: Thermal Clip Challenge
- Citadel Arena: Prothean Challenge
- Citadel Arena: Cerberus Challenge
- Citadel Arena: Charity Reaper Challenge
- Citadel Arena: Unusual Scores