Ongar Castle is a historic site located in Ongar, Essex, England. It was built in the 12th century by Richard de Montfichet, a nobleman, and served as a defensive structure during the medieval period. The castle features a motte-and-bailey design, which includes a raised earthwork mound and a surrounding ditch. Today, the remains of Ongar Castle are a popular attraction for visitors interested in history. Although much of the original structure has eroded over time, the site offers insights into medieval architecture and the region's past. The castle grounds are open to the public, providing a scenic spot for exploration.