| Species 003 | (Language fragments from this species were contained in Six's neural transceiver, Collective has little recollection of this species because they were assimilated near its beginnings) |
| Species 13 | Tuktak |
| Species 29 | Iconians |
| Species 050 | Voth |
| Species 116 | |
| Species 125 | (Borg Queen's original species in Voyager) |
| Species 136 | (Species entirely assimilated, attempted to spread a virus disconnecting a probe of drones from the collective, the probe was re-assimilated) |
| Species 149 | |
| Species 180 | Ferengi |
| Species 218 | Talaxians |
| Species 230 | El Aurian |
| Species 259 | |
| Species 260 | Sikkaran |
| Species 261 | Devore |
| Species 262 | |
| Species 263 | |
| Species 264 | Krenim |
| Species 312 | |
| Species 315 | Dralian |
| Species 329 | Kazon |
| Species 407 | Lennli |
| Species 433 | Greech |
| Species 478 | Hirogen |
| Species 521 | Shivolians |
| Species 571 | |
| Species 580 | Mikhal Travelers |
| Species 642 | Narisian |
| Species 698 | Norcadians |
| Species 700 | Pralor |
| Species 775 | Canine |
| Species 874 | |
| Species 867 | |
| Species 912 | Dulaph |
| Species 1137 | Calentar |
| Species 1429 | |
| Species 1432 | Edtani |
| Species 1567 | |
| Species 1599 | Batazoid |
| Species 1732 | Q |
| Species 1811 | |
| Species 1881 | Voldranaii |
| Species 2000 | Cardassians |
| Species 2461 | Brunali |
| Species 2463 | Brenari |
| Species 2822 | |
| Species 3105 | Rhawn |
| Species 3259 | Vulcans |
| Species 3783 | Romulans |
| Species 3592 | Bajorans |
| Species 3593 | Bynars |
| Species 3836 | Lynnrali |
| Species 4228 | Hazari |
| Species 4672 | |
| Species 4673 | |
| Species 4774 | Skedan |
| Species 5008 | Klingon |
| Species 5174 | |
| Species 5200 | Denobulan |
| Species 5618 | Humans |
| Species 5619 | Dolphins |
| Species 5622 | Gorn |
| Species 5623 | Caitiens |
| Species 5625 | Kzinti |
| Species 5626 | Trill |
| Species 5627 | Trill symbiote |
| Species 5628 | Breen |
| Species 5973 | (Non-corporeal being from 'The Haunting of Deck 12, Voyager) |
| Species 6291 | Yridians |
| Species 6339 | |
| Species 6340 | Kharian |
| Species 6649 | Neyser |
| Species 6961 | Ktarians |
| Species 6963 | Andorians |
| Species 6971 | Orion |
| Species 7509 | T'Kari |
| Species 7690 | Ankari |
| Species 8472 | (Viewed by the Borg as biological perfection) |
| Species 8532 | Taaf |
| Species 8777 | Vidian |
| Species 9341 | |
| Species 9552 | Hedeomik |
| Species 9591 | |
| Species 9673 | Prophets / Pah-Wraith |
| 10026 | (Possibly the Nihydron) |
| Species 10028 | Vorta |
| Species 10029 | Jem'Hadar |
| Species 10030 | Vrauzux |
| Species 10031 | Vrauzux Sumbiote |
| Species 10032 | Eskaron |
| Species 10033 | Qhil |
| Species 10034 | Aiceik |
| Species 10035 | Shiqror |
| Species 10036 | Cularin |