State Trunk Highway 61 (often called Highway 61, STH-61 or WIS 61) was a number assigned to a state highway in the U.S. state of Wisconsin. It traveled roughly along:

• present-day Wisconsin Highway 81 (WIS 81) from Cassville to Beloit. From 1924 to 1926, WIS61 extended westward via present-day WIS81.

• the pre-Interstate alignment of Wisconsin Highway 15 (WIS 15) from Beloit to Milwaukee (now part of CTH-X, WIS11, WIS67, US12, CTH-ES, and National Avenue). WIS61 had always follow at least a portion of what later became WIS15. WIS15 had plenty of alterations before being superseded by I-43 in 1988.

The route was later designated as Wisconsin Highway 14 from 1926 to 1933 (before US 14 exists).

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