Eldon House is a museum featuring 19th century period mansion and gardens. The Eldon House Interpretation centre is located on 481 Ridout Street, London, Ontario, Canada. The Eldon House and lands are known collectively as Harris Park. Celebrating its 175th anniversary in 2009/2010, Eldon House is London, Ontario's oldest residence. Captain John Harris named Eldon House after the Earl of Eldon, whom he admired.