Yeoman Tamura was a member of Starfleet who served aboard the USS Enterprise under Captain James T. Kirk during the mid-2260s.
In 2267, Tamura was part of the landing party that visited Eminiar VII. During the mission, Spock asked her for a scientific survey to identify the nature of Vendikar's attack. Her confusing lack of confirmation for the attack was one clue that helped Spock realize the war between Eminiar and Vendikar existed only as a series of computer models.
Later, Spock left her in charge of Mea 3, with instructions to prevent Mea from reporting to a disintegration station, as citizens of Eminiar VII dutifully did when declared casualties.