Robert Dickson Orrock Sr. is an American politician. From 1990 until 2026, he was a member of the Virginia House of Delegates, representing the 66th district in the east-central part of the state, including parts of Caroline and Spotsylvania counties; the former county is included in the Greater Richmond Region and the latter county is included in the Washington metropolitan area. From 1990–1991, the District encompassed all of Spotsylvania County, part of Caroline County, and part of the Fredericksburg City. From 1992–2001, the District encompassed part of Spotsylvania County and all of Fredericksburg City. He is a member of the Republican Party. Orrock was defeated by Democrat Nicole Cole in the 2025 Virginia House of Delegates election.