Nana Visitor is an American actress, best known for playing Major – later Colonel – Kira Nerys in the television series Star Trek: Deep Space Nine and Jean Ritter in the television series Wildfire.

Visitor began her acting career in the 1970s on the Broadway stage. Her film debut came in the 1977 horror film The Sentinel. On television, Visitor co-starred in the short-lived 1976 sitcom Ivan the Terrible and from 1978 to 1982, had short-lived regular roles on three soap operas: Ryan's Hope, The Doctors, and One Life to Live. She continued to make guest appearances on a number of series throughout the 1980 and early 1990s, including Hunter, MacGyver, Remington Steele, Knight Rider, and Highway to Heaven, and many more.

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From 1993 to 1999, Visitor appeared in Star Trek: Deep Space Nine as Major (later Colonel) Kira Nerys, a former freedom fighter/terrorist from the planet Bajor, who fought against the occupation of her world by the Cardassians. After the occupation ended, she was appointed as first officer of the series's eponymous space station, built by the Cardassians and turned over to Starfleet. She revisited the character, as a voice actress, in the third season of the animated series Star Trek: Lower Decks. She was also interested to play the character of Kathryn Janeway in the series Star Trek: Voyager, filmed at the same time.

After DS9 ended, Visitor had a recurring role as villain Dr. Elizabeth Renfro on the television series Dark Angel. Visitor then starred as Roxie Hart in both the touring and Broadway companies of the musical Chicago including starring as Hart as curtains rose again after September 11, 2001. Visitor was then cast as Jean Ritter on the ABC Family series Wildfire, which premiered on June 20, 2005.

2024 saw the publication of her book, "Star Trek: Open a Channel: A Woman's Trek", a look at the female characters of the Star Trek franchise, and the actors who portrayed them.