Telepathy is an ability that allows a being to read the mind of another being. Certain hok'tar have shown telepathy, but this often requires genetic advancement or prolonged evolution. Eggar was given telepathic abilities by Nirrti, as was Khalek by Anubis. (SG1: "Metamorphosis", "Prototype")
Adria, the leader of the Ori or "Orici" displayed this ability many times.
The Wraith also possess telepathy. They can only directly read the minds of their own species, but they can influence Humans. (SGA: "Rising", "The Gift")