The Tollan are an advanced human civilization who are introduced in season 1's "Enigma" when the SGC helps a group of them relocate from the original Tollan homeworld that had undergone catastrophic volcanic activity. The Nox take the Tollan in while they continue to search for a new home, later revealed to be named Tollana. The Tollan have a strict policy against sharing technology with more "primitive" races, instituted after such a transfer caused the civilization of their neighboring planet Serita to destroy itself in a single day. Teal'c notes in season 3's "Pretense" that despite the Tollans' technological superiority, they "do not think strategically". The Tollan are wiped out by the forces of the Goa'uld Tanith in season 5's "Between Two Fires" after the Goa'uld Anubis developed shields impervious to Tollan weaponry.
- Narim, played by Garwin Sanford (seasons 1, 3, 5) – An influential Tollan who befriends SG-1 after they save him and a group of fellow Tollans in "Enigma". He develops an apparent attraction to Carter and reconfirms his feelings for her in "Pretense", although she informs him that she is not looking for a relationship at that time. After the death of the Tollan leader, Omoc, in "Between Two Fires", Narim and SG-1 discover that his government was collaborating with the Goa'uld. Narim takes action to spare Earth from destruction, but the Goa'uld begin attacking the planet. Narim escorts SG-1 to the Stargate and stays behind to help his people fight. Shortly afterwards, Narim informs Earth of Tollana's devastations via a transmission, which ends abruptly.
- Travell, played by Marie Stillin (seasons 3, 5) – High Chancellor and a member of the Curia, the Tollan's highest ruling body. She is first seen in "Pretense", where she presides over the hearings about the future of the Goa'uld Klorel and his unwilling host Skaara. In season 3's "Shades of Grey", Travell participates in an undercover operation conducted by the SGC to expose the rogue NID agents as thieves. In Travell's final appearance in "Between Two Fires", she offers Tollan ion cannon technology to Stargate Command, later discovered to be part of Tanith's extortion of the Curia.
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