The ninth season of the American Western television series Bonanza premiered on NBC on September 17, 1967, with the final episode airing July 28, 1968.

Season nine starred Lorne Greene, 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").

A regular character is their ranch cook, Hop Sing.

[11] After three straight seasons in the number one spot, it slipped to #6 in the Nielsen ratings.