Commander T'Pol /tɨˈpɒl/ is a fictional character played by Jolene Blalock in Star Trek: Enterprise. She is a Vulcan who serves as the science officer aboard the starship Enterprise.

According to producer Rick Berman, it was originally intended that a younger version of T'Pau would be the Vulcan officer serving on the titular starship in Star Trek: Enterprise. Instead, after determining there were legal difficulties in using the original series character, the producers created T'Pol.

T'Pol is the first Vulcan officer to serve a prolonged term on a human vessel. The previous record was 10 days; by comparison, T'Pol served aboard the Enterprise for ten years (2151–2161). As a Sub-Commander serving the Vulcan High Command, she was stationed aboard the Enterprise in April 2151, as an observer to Captain Jonathan Archer and his crew, who the High Command insisted were not ready for interstellar space exploration. After the success of the Enterprise's initial mission led to the vessel being given an extended exploration mandate, T'Pol requested to stay aboard.

Jolene King Blalock (born March 5, 1975) is an American film and television actress and model, perhaps best known for playing the Vulcan T'Pol on the UPN science fiction series Star Trek: Enterprise. She is a regular guest star in television films and series and has appeared in a few feature films.

A popular model, Blalock left home at 17 to model in Europe and Asia. She has appeared on the cover of many men's lifestyle magazines, was twice featured in Maxim's "Girls of Maxim" gallery and was named the 10th sexiest woman in the world in 2005 by FHM. She posed for a clothed fashion layout in Playboy in April 2002. She was later interviewed by the magazine for its "20Q" section in February 2005.

Blalock spent years dieting as a model and was relieved to move into acting, saying: "I'm jaded by my experiences in the modelling industry. You're never skinny or perfect enough, and it was difficult mentally making the transition to acting."

She made her television debut in sitcom Veronica's Closet, before guest appearances in The Love Boat: The Next Wave, CSI: Crime Scene Investigation, JAG, and starring as Medea in a 2000 television movie adaptation of Jason and the Argonauts. She also appeared in On the Edge and the mini-series The Diamond Hunters before being cast in Star Trek: Enterprise.