The Art Directors Guild (ADG; IATSE Local 800) is a labor union and local of the International Alliance of Theatrical and Stage Employees (IATSE) representing 3,278 motion picture and television professionals in the United States and Canada.

The ADG's sponsored activities include the annual ADG Excellence in Production Design Awards, the professional quarterly news magazine Perspective, an art gallery called Gallery 800, technology training programs, and a film society.

Local 800 has four main craft classifications:

In addition, the ADG has recently included previs artists into their membership.

Individual crafts represented by the ADG:

The Art Directors Guild was originally named the Society of Motion Picture Art Directors (SMPAD), which was founded by 59 Art Directors on May 6, 1937, at a meeting at the Hollywood Roosevelt Hotel.

After World War II, many "below the line" industry labor organizations, including SMPAD, signed on with the IATSE for overall union representation. SMPAD became more active, grew in membership, and expanded opportunities as television developed. In 1967 the Society included "television" to their name before settling on its current moniker, the "Art Directors Guild" in 1998.

The Art Directors Guild included only men until 1971. Production designer Polly Platt was the first woman inducted into the Guild, in 1971. Toby Carr Rafelson was the second woman inducted.