Oliver Hazard Perry Throck Morton, commonly known as Oliver P. Morton, was a U.S. Republican Party politician from Indiana. He served as the 14th governor of Indiana during the American Civil War, and was a stalwart ally of President Abraham Lincoln. Morton worked hard to maximize Indiana's contribution to the war effort and marginalize the obstructionists. He was a principled and effective leader who fought for equality and nationalism through the use of governmental power. His forceful pursuit of civil rights and prosecution of Copperheads and white supremacists gained him lasting enemies among the antiwar elements. Morton thwarted and neutralized the Democratic-controlled Indiana General Assembly. He exceeded his constitutional authority by calling out the militia without approval, and during the period of legislative suppression he privately financed the state government through unapproved federal and private loans. He was criticized for arresting and detaining political enemies and suspected southern sympathizers. As one of President Lincoln's "war governors", Morton made significant contributions to the war effort, more than any other man in the state, and earned the lifelong gratitude of former Union soldiers for his support.

The governor of Indiana is the head of government of the U.S. state of Indiana. The governor is elected to a four-year term and is responsible for overseeing the day-to-day management of the functions of many agencies of the Indiana state government. The governor also shares power with other statewide executive officers, who manage other state government agencies. The governor works out of the Indiana Statehouse and holds official functions at the Indiana Governor's Residence in the state capital of Indianapolis.