Mystery Ranch may refer to:Mystery Ranch, a 1921 Western mystery novel by Arthur Chapman Mystery Ranch , a 1932 American Western film Mystery Ranch , a 1934 Western film made by Reliable Pictures Mystery Ranch, a 1958 children's novel, number four in The Boxcar Children series Mystery Ranch of Bozeman, Montana, a backpack manufacturer founded in 2000 Mystery Ranch (company), a backpack manufacturer and military contractor