Da is a 1978 comedy play by Irish playwright Hugh Leonard. The play had its New York City premiere at the off-off-Broadway Hudson Guild Theatre in 1978, and this production transferred to Broadway shortly after the completion of its run. It was directed by Melvin Bernhardt and produced on Broadway by Lester Osterman, Marilyn Strauss and Marc Howard. It opened at the Morosco Theatre on 1 May 1978 and closed on 1 January 1980 after 697 performances. The scenic design was by Marjorie Kellogg, the costume design by Jennifer von Mayrhauser, and the lighting Design by Arden Fingerhut. The original cast included Barnard Hughes as Da, Brian Murray as Charlie Now, Lois De Banzie as Mrs. Prynne, Mia Dillon as Mary Tate, Sylvia O'Brien as Mother, Lester Rawlins as Drumm, Richard Seer as Young Charlie