Admiral Sarah Brennan was a female Human Starfleet officer in the early 24th century. In 2316, she and Admiral Sinek informed Elsa that her husband had been killed in an accident.

By 2359, Sarah Brennan was the second-oldest officer still on active duty. That year, she and Will Patterson informed Gretchen Janeway of her husband Edward's death. (VOY short story: "Uninvited Admirals")