William Dennison Porter (November 24, 1810 – January 4, 1883) was an American lawyer and politician who served as the 52nd lieutenant governor of South Carolina.

[2] Prior to the Civil War, Porter argued that states had the right to secede from the Union.

[3] After the Civil War in 1865, Porter because the first popularly-elected lieutenant governor in South Carolina; his predecessors were chosen by the General Assembly.

"[5] After leaving office, Porter served as attorney for the city of Charleston, South Carolina.

In November 1868, he argued a case before the South Carolina Supreme Court in which voter fraud had been alleged.