The Tony Award for Best Performance by a Leading Actor in a Play is an honor presented at the Tony Awards, a ceremony established in 1947 as the Antoinette Perry Awards for Excellence in Theatre, to actors for quality leading roles in a Broadway play. The awards are named after Antoinette Perry, an American actress who died in 1946. Honors in several categories are presented at the ceremony annually by the Tony Award Productions, a joint venture of The Broadway League and the American Theatre Wing, to "honor the best performances and stage productions of the previous year." Despite the award first being presented in 1947, there were no nominees announced until 1956.

The Antoinette Perry Award for Excellence in Broadway Theatre, more commonly known as the Tony Award, recognizes excellence in live Broadway theatre. The awards are presented by the American Theatre Wing and The Broadway League at an annual ceremony in Manhattan. The ceremony is usually held on the second Sunday of June.