Boss Spearman is a fictional character from the 2003 film "Open Range," directed by Kevin Costner. He is portrayed as a seasoned cattleman and a strong leader, known for his calm demeanor and moral integrity. Spearman values freedom and the open range, embodying the spirit of the American West. In the film, Boss Spearman is played by Robert Duvall, who brings depth to the character. Spearman's journey involves protecting his cattle and his friends from corrupt forces, showcasing themes of loyalty and justice. His character represents the struggles of ranchers during the late 19th century in the United States.