State Trunk Highway 45 (often called Highway 45, STH-45 or WIS 45) was a number assigned to two different state highways in the U.S. state of Wisconsin:

State Trunk Highway 45 marker
State Trunk Highway 45
Route information
Maintained by WisDOT
Existed1918–1934
Location
CountryUnited States
StateWisconsin
Highway system
US 45 WIS 46