Natasha "Tasha" Yar is a fictional character that mainly appeared in the first season of the American science fiction television series Star Trek: The Next Generation. Portrayed by Denise Crosby, Yar is chief of security aboard the Starfleet starship USS Enterprise-D and carries the rank of lieutenant.

The first season of the American television science fiction series Star Trek: The Next Generation commenced airing in broadcast syndication in the United States on September 28, 1987, and concluded on May 16, 1988, after 26 episodes were broadcast. Set in the 24th century, the series follows the adventures of the crew of the Starfleet starship Enterprise-D. It was the first live-action television series in the franchise to be broadcast since Star Trek: The Original Series was cancelled in 1969, and the first to feature all new characters. Paramount Television eventually sought the advice of the creator of Star Trek, Gene Roddenberry, who set about creating the new show with mostly former The Original Series staff members. An entirely new cast were sought, which concerned some members of The Original Series crew, as Roddenberry did not want to re-tread the same steps as he had in the first series to the extent that well-known Star Trek aliens such as Vulcans, Klingons and Romulans were banned at first.