William Forrester Owens is an American former politician who served as the 40th Governor of Colorado, from 1999 to 2007. A member of the Republican Party, he was re-elected in 2002, amassing 62.6% of the vote, the largest Republican share of the vote in state history. As of 2024, he is the last Republican to serve as Governor of Colorado.

The governor of Colorado is the head of government of the U.S. state of Colorado. The governor is the head of the executive branch of Colorado's state government and is charged with enforcing state laws. The governor has the power to either approve or veto bills passed by the Colorado General Assembly, to convene the legislature, and to grant pardons, except in cases of treason or impeachment. The governor is also the commander-in-chief of the state's military forces.