The fourth season of the American Western television series Bonanza premiered on NBC on September 23, 1962, with the final episode airing May 26, 1963.

[1] The series was developed and produced by David Dortort, and season four starred Lorne Greene, Pernell Roberts, Dan Blocker, and Michael Landon.

[3] Bonanza is set around the Ponderosa Ranch near Virginia City, Nevada and chronicles the weekly adventures of the Cartwright family, consisting of Ben Cartwright and his three sons (each by a different wife), Adam, Eric ("Hoss"), and Joseph ("Little Joe").

Bing Russell was added to the series as recurring character Deputy Clem Foster beginning with episode 18, "Half a Rouge".

[5] Additional locations were Griffith Park for episode 29, "Five into the Wind",[6] and Bronson Canyon for episode 32, "Rich Man, Poor Man"[7] Season four aired on Sundays from 9:00 pm–10:00 pm on NBC.