A theatre director or stage director is a professional in the theatre field who oversees and orchestrates the mounting of a theatre production such as a play, opera, dance, drama, musical theatre performance, etc. by unifying various endeavors and aspects of production. The director's function is to ensure the quality and completeness of theatre production and to lead the members of the creative team into realizing their artistic vision for it. The director thereby collaborates with a team of creative individuals and other staff to coordinate research and work on all the aspects of the production which includes the Technical and the Performance aspects. The technical aspects include: stagecraft, costume design, theatrical properties (props), lighting design, set design, and sound design for the production. The performance aspects include: acting, dance, orchestra, chants, and stage combat.

An actor-manager is a leading actor who sets up their own permanent theatrical company and manages the business, sometimes taking over a theatre to perform select plays in which they usually star. It is a method of theatrical production used consistently since the 16th century, particularly common in 19th-century Britain and the United States.