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A mentor was a more experienced person who assisted another, less experienced, person in their professional or personal development.

A 2152 draft biography of Henry Archer described his mathematics regarding the flux paradox as being more accurate than those of his mentors from Vulcan. (ENT: "Singularity")

Sylvia Tilly considered Michael Burnham her mentor. Burnham considered Sarek hers. (DIS: "Lethe")

According to Spock in 2269, Rayna Kapec loved Flint both as a mentor and a father. (TOS: "Requiem for Methuselah")

Beverly Crusher considered Dalen Quaice her mentor. (TNG: "Remember Me")

In 2367, Data described several acting masters as his mentors, namely Stella Adler, Constantin Stanislavsky and Garnav. (TNG: "Devil's Due")

Benjamin Sisko considered Curzon Dax to have been his mentor. (DS9: "A Man Alone", "Tears of the Prophets")

Elim Garak thought of his father, Enabran Tain, as his mentor. (DS9: "Improbable Cause", "In Purgatory's Shadow")

The Doctor considered himself the mentor of Kes. (VOY: "Darkling")

Professor Forra Gegen was described as the mentor of his assistant, Tova Veer, by Minister Odala in 2373. (VOY: "Distant Origin")

According to The Doctor in 2374, if he had had a mentor after his activation, his social experiences aboard USS Voyager would have gone more smoothly. He therefore tried to be such a mentor to Seven of Nine, whom he considered to be in a similar situation after her separation from the Borg Collective. The next year, while drunk, Seven described The Doctor as her mentor. (VOY: "Prey", "Timeless") Kathryn Janeway was similarly described as Seven's mentor by Chakotay, while calling Seven the pupil in their relationship. (VOY: "Hope and Fear")

In 2374, Vreenak described Sisko as being, among other things, a mentor. (DS9: "In the Pale Moonlight")

Later that year, Dukat described himself as the mentor of Damar. (DS9: "Tears of the Prophets")

According to Koval in 2375, Vice Admiral Fujisaki was the mentor of Luther Sloan. (DS9: "Inter Arma Enim Silent Leges")

In 2377, Captain Janeway considered Q to be in need of a mentor. When she approached Neelix about it, he agreed to deal with Q. When Janeway reminded him that Q was "no ordinary child", Neelix replied he was "no ordinary mentor". (VOY: "Q2")