Members of the following species have been assimilated by the Borg Collective. Some species, such as the Kazon have been deemed unworthy of assimilation.
By designation
By name
By appearance
- Axum's species (VOY: "Unimatrix Zero, Parts I" & "II")
- Bajoran (VOY: "Survival Instinct")
- Bolian (Star Trek: First Contact)
- Brunali (VOY: "Collective")
- Cardassian (Star Trek: First Contact)
- Hirogen (VOY: "Unimatrix Zero, Parts I" & "II")
- Human/Humanoid (TNG: "Q Who", et. al)
- Kelis' species (VOY: "Unimatrix Zero, Parts I" & "II")
- Klingon (Star Trek: First Contact, VOY: "Unimatrix Zero, Parts I" & "II")
- Ktarian (VOY: "Dark Frontier")
- Lansor's species (VOY: "Survival Instinct")
- Norcadian (VOY: "Collective")
- Peliar Zel native (VOY: "Infinite Regress")
- Rasiinian (VOY: "Infinite Regress")
- Repto-humanoid (VOY: "Infinite Regress")
- Romulan (VOY: "Unity")
- Scaly Aliens (VOY: "Infinite Regress")
- Swarm species (VOY: "Infinite Regress")
- Tailheads (VOY: "Infinite Regress")
- Tarkalean (ENT: "Regeneration")
- Vidiian (VOY: "Infinite Regress")
- Voth (VOY: "Infinite Regress")
- Vulcan (VOY: "Unimatrix Zero, Parts I" & "II")
- Wysanti (VOY: "Collective")
By reference
- Caatati (VOY: "Day of Honor")
- El-Aurian (TNG: "The Best of Both Worlds")
- Farn (VOY: "Unity")
- Ferengi (VOY: "Infinite Regress")
- Hazari (VOY: "Think Tank")
- Krenim (VOY: "Infinite Regress")
- Parein (VOY: "Unity")
- Sakari (VOY: "Blood Fever")
- Talaxian (VOY: "The Raven", "Mortal Coil")
- Terellian (VOY: "Infinite Regress")