The Westheimer Company was an an optical visual effects house based in Hollywood, California, which provided special effects for Star Trek: The Original Series. It was owned and operated by Joseph Westheimer.

The Westheimer Company was nominated for an Emmy Award for Special Classification of Individual Achievements for its work on Star Trek: The Original Series in 1968.

Among the employees at The Westheimer Company who were involved with Star Trek was Joseph M. Wilcots, who later became an Emmy Award-nominated cinematography, and Richard Edlund, who later became an Oscar-winner.