Kurt Johnstad is an American screenwriter. He has worked on several films including 300, for which he was nominated for a Saturn Award, along with Michael Gordon and Zack Snyder. He also wrote the screenplays for Act of Valor, 300: Rise of an Empire and Atomic Blonde, and was initially tapped to write one of two competing screenplays for Aquaman; Will Beall's script was eventually chosen for the film.

Johnstad grew up working on a cattle farm in Wisconsin. Among his family were two sisters and his father, who was an Air Force fighter pilot, and his mother, an English teacher.Johnstad graduated high school at 16 and spent a year traveling. He enrolled in the California Institute of the Arts in 1986 to study film and completed the program in three years.

Johnstad began working on music videos and television movies for the next four years.Among the people he had worked with was director Zack Snyder, who offered him a job as his first assistant director which lead the two to work with each other for the next ten years.

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