Scenic design, also known as stage design or set design, is the creation of scenery for theatrical productions including plays and musicals. The term can also be applied to film and television productions, where it may be referred to as production design. Scenic designers create sets and scenery to support the overall artistic goals of the production. Scenic design is an aspect of scenography, which includes theatrical set design as well as light and sound.

Modern scenic designers are increasingly taking on the role of co-creators in the artistic process, shaping not only the physical space of a production but also influencing its blocking, pacing, and tone. As Richard Foreman famously stated, scenic design is a way to "create the world through which you perceive things happening." These designers work closely with the director, playwright, and other creative members of the team to develop a visual concept that complements the narrative and emotional tone of the production. Notable scenic designers who have embraced this collaborative role include Robin Wagner, Eugene Lee, and Jim Clayburgh

The origins of scenic design may be found in the outdoor amphitheaters of ancient Greece, when acts were staged using basic props and scenery. Because of improvements in stage equipment and drawing perspectives throughout the Renaissance, more complex and realistic sets could be created for scenic design. Scenic design evolved in conjunction with technological and theatrical improvements over the 19th and 20th centuries.

In the early 20th century, American scenic design underwent a dramatic transformation with the introduction of the New Stagecraft. Drawing inspiration from European pioneers like Adolphe Appia and Edward Gordon Craig, American designers began moving away from the overly detailed naturalism of the 19th century. Instead, they embraced simplified realism, abstraction, mood-driven environments, and symbolic imagery. Leaders of this movement, including Robert Edmond Jones, Lee Simonson, and Norman Bel Geddes, laid the foundation for a more interpretive and artistic approach to stage design in the United States.

Following the New Stagecraft, designers like Jo Mielziner and Boris Aronson helped define a style known as poetic realism. Characterized by soft lighting, romantic imagery, scrims, and fragmented sets, this style prioritized the emotional tone of a production over strict realism. These designers often collaborated closely with playwrights and directors, shaping the mood and meaning of American theater classics like the early works of Arthur Miller and Tennessee Williams.

A key element of modern trends is the integration of spectacle. This movement towards larger-than-life visuals, mechanized scenery, and intricate special effects has reshaped both Broadway productions and regional theater. Designers like David Mitchell, known for his work on kinetic sets, exemplify the push towards spectacle that mirrors the influence of cinema on stage design. This trend emphasizes the audience's sensory experience, focusing on visual impact and technical prowess rather than traditional storytelling techniques alone.

At the same time, many designers are exploring minimalism and abstraction, moving away from overly realistic representations to create symbolic and suggestive environments that focus on mood rather than realism. The evolving role of the designer as a collaborator with directors and playwrights has also reinforced these trends, as designers today have a more equal voice in shaping the vision and narrative of a production.

Scenic design involves several key elements: