Denise Michelle Crosby is an American actress and model known for portraying Security Chief Tasha Yar mainly in season one of Star Trek: The Next Generation, and Yar's daughter, the half-Romulan Commander Sela, in subsequent seasons. She is also known for her numerous film and television roles, and for starring in and producing the film Trekkies.

Dennis Michael Crosby was an American singer and occasional actor, the son of singer and actor Bing Crosby and his first wife Dixie Lee, and twin brother of Phillip Crosby. He was the father of Star Trek TNG actress Denise Crosby, and of screenwriter/film producer Gregory Crosby.