Mark A. Darr (born July 3, 1973) is an American politician from Springdale, Arkansas, who was his state's 19th lieutenant governor from 2011 to 2014. A member of the Republican Party, he was elected in 2010 to succeed Democrat Bill Halter. To win the second-ranking post in state government, he defeated another Democrat, state Senator and former House Speaker Shane Broadway by a margin of 51 to 49 percent. On February 1, 2014, under sanction for ethics violations involving illegal use of campaign funds, Darr resigned as lieutenant governor.