The word may have one of the following meanings.

• In Greek mythology, Nestor was the son of Neleus, the King of Pylos and Chloris. See Nestor (mythology).

• Nestor is also an archaeological site and a municipality in the west-southwestern part of Messenia

• Nestor the Chronicler is a compiler of the Primary Chronicle of the East Slavic peoples.

• The Institute of Astroparticle Physics Nestor in the town of Pylos in Greece operates a deep sea Neutrino telescope in the Ionian Sea

• In Ornithology, Nestor is a genus of parrots.

• Nestor is a fictional character from Belgian artist Hergé's renowned Tintin comic strip books.

• Nester is a mascot character associated with Nintedo of America and Nintendo Power magazine.

• In the Star Trek universe, a Nestor is a legal advisor to the offender in Cardassian criminal trials. Unlike the defense lawyer, the Nestor is barred from directly addressing the tribunal.

• In the book I, Robot and the movie I, Robot, Nestor is the common nickname of NS-series robots.

• Nestorius (c.386–c.451) was Patriarch of Constantinople.
• Nestor is a chapter in James Joyce's novel Ulysses.

• Nestor Burma is a fictional detective created by the French author Léo Malet.

• Nestor is a belgian rock band… (a.k.a Edgar Morbacks)

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