Michigan's 45th House of Representatives district (also referred to as Michigan's 45th House district) is a legislative district within the Michigan House of Representatives located in part of Kalamazoo, Calhoun, and Jackson counties.

[2] The district was created in 1965, when the Michigan House of Representatives district naming scheme changed from a county-based system to a numerical one.

[3] Kalamazoo County (part) St. Joseph County (part) Allegan County (part) Barry County (part) Berrien County (part) Van Buren County