State Trunk Highway 43 (often called Highway 43, STH-43 or WIS 43) was a number assigned to two different state highways in the U.S. state of Wisconsin:

State Trunk Highway 43 marker
State Trunk Highway 43
Route information
Maintained by WisDOT
Existed1918–1974
Location
CountryUnited States
StateWisconsin
Highway system
I-43 WIS 44