The Mark Taper Forum is a 739-seat thrust stage at the Los Angeles Music Center designed by Welton Becket and Associates on the Bunker Hill section of Downtown Los Angeles. Named for real estate developer Mark Taper, the Forum, the neighboring Ahmanson Theatre and the Kirk Douglas Theatre are all operated by the Center Theatre Group.

In theatre, a thrust stage is one that extends into the audience on three sides and is connected to the backstage area by its upstage end. A thrust has the benefit of greater intimacy between performers and the audience than a proscenium, while retaining the utility of a backstage area. This is in contrast to a theatre in the round, which is exposed on all sides to the audience, is without a backstage, and relies entirely on entrances in the auditorium or from under the stage. Entrances onto a thrust are most readily made from backstage, although some theatres provide for performers to enter through the audience using vomitory entrances. As with an arena, the audience in a thrust stage theatre may view the stage from three or more sides. Because the audience can view the performance from a variety of perspectives, it is usual for the blocking, props and scenery to receive thorough consideration to ensure that no perspective is blocked from view. A high-backed chair, for instance, when placed stage right, could create a blind spot in the stage left action.