State Trunk Highway 43
Route information
Maintained by WisDOT
Existed	1918–1974
Location
Country	United States
State	Wisconsin
Highway system
Wisconsin State Trunk Highway System Interstate US State Scenic Rustic
← I-43 → WIS 44

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:

• Highway 43 from 1917 to 1923, assigned the Highway 27 designation in 1923
• Highway 43 from 1923 to 1974, currently routed as Highway 142 from Burlington to Kenosha