Cor Caroli IX was a planet located in the space of the galaxy's Alpha Quadrant, the ninth planet in orbit of the Cor Caroli star system. (TNG episode: "Allegiance")

At the early 24th century, Cor Caroli IX was a Vulcan colony world in the Alpha Quadrant, with a small population numbering in the hundreds.

In the year 2337, a small one-man craft crashed on Cor Coroli IX, piloted by a Romulan named Rajari. He was aided by a Vulcan woman named T'Pas, who Rajari then raped and impregnated. The child of that union, Soleta, was primarily raised on Cor Coroli IX. (NF - No Limits short story: "Revelations")

By the 2370s, Cor Caroli IX was a holding of the Romulan Star Empire, and was considered a friendly port of call by the Romulan Imperial Fleet. (ST video game: Starfleet Command III)

In SFC3 gameplay, this name was part of a list that were applied to planets on the game map, with random attributes assigned to them. Both "Revelations" and SFC3 used a misspelling, "Cor Coroli".