William Duncan Connor (March 24, 1864 – November 20, 1944) was a Canadian-born American politician and the 20th Lieutenant Governor of Wisconsin from 1907–1909.
William D. “W.D.” Connor moved to Marshfield, Wisconsin in 1895, and became a successful lumberman and real estate investor in the Pacific Northwest.
Very involved in politics and public service, he served for twenty years as a member of the Wood County Board of Supervisors, and was twice elected chairman.
Another key piece of legislation William Duncan Connor played an important role in the passage of the Wisconsin Forestry Act which later was ratified to become Forest Crop Law and later still the Wisconsin Managed Forest Law, which was aimed at promoting sustainable timber management in the state.
Connor, who was a member of the Wisconsin State Assembly at the time, was a strong advocate for the Forestry Act and played a key role in its development.
Overall, William Duncan Connor's advocacy for the Wisconsin Forestry Act helped to establish a framework for sustainable timber management in the state, which has had lasting benefits for both the environment and the economy.
Connor, along with Marinette lumberman Isaac Stephenson, were La Follette's main political backers from the business community.
After serving as lieutenant governor, Connor withdrew from statewide elective politics, although he remained active at the local and county level.