Martha Kathleen Henry was an American-born Canadian stage, film, and television actress. She was noted for her work at the Stratford Festival in Stratford, Ontario.

The Stratford Festival is a theatre festival which runs from April to October in the city of Stratford, Ontario, Canada. Founded by local journalist Tom Patterson in 1952, the festival was formerly known as the Stratford Shakespearean Festival, the Shakespeare Festival and the Stratford Shakespeare Festival. The festival was one of the first arts festivals in Canada and continues to be one of its most prominent. It is recognized worldwide for its productions of Shakespearean plays.