Mary Lou Spradling Slinkard (born August 1943) is a Republican former member of the Arkansas House of Representatives. From 2013 to 2015, she represented District 92 in Benton County in far northwestern Arkansas. From 2009 to 2013, she was the representative for District 100. A native and a resident of Gravette, she is the former county clerk of Benton County, a position in which she served for twenty-eight years. She assumed the representative's position in 2009 and was reelected without opposition in the general elections of 2010 and 2012.