Bill Landen (born February 21, 1956) is a Republican member of the Wyoming Senate, representing the 27th district since 2007. The 27th district represents Natrona County, Wyoming. He currently serves as a member of the Senate Natural Resources and Infrastructure Committee, Multistate Highway Transportation Agreement Cooperating Committee, Select Committee on School Facilities, and Travel, Recreation, Wildlife & Cultural Committee. Additionally, he chairs the Capitol Interpretive Exhibits and Way-finding Subcommittee, the Air Transportation Liaison Committee, and the Transportation, Highways, & Military Affairs Committee.

Landen attended Casper College, where he received an associate degree, the University of Wyoming for his Bachelor of Science, and Colorado State for graduate school.