Levi Augustus Mackey (November 25, 1819 – February 8, 1889) was a United States representative from Pennsylvania. Mackey was born in White Deer Township, Union County, Pennsylvania. In 1837, he graduated from Union College in Schenectady, New York, with Phi Beta Kappa honors and membership in The Kappa Alpha Society, before studying law at Dickinson College in Carlisle, Pennsylvania. From 1841 until 1855, Mackey practiced law in Lock Haven, Pennsylvania. He then served as the president of Lock Haven Bank and as president of the Bald Eagle Valley Railroad.