High Ongar is a village and civil parish in the County of Essex, England. It is located a mile (1½ km) north-east of [[Place:Chipping Ongar, Essex, England|Chipping Ongar, 8 miles (13 km) west of Chelmsford and 6 miles (10 km) north-west of Brentwood.
The village of High Ongar has existed since the beginning of the 17th century, although in the Middle Ages it was probably no more than a tiny hamlet. The oldest surviving house in the village is the timber-framed and weather-boarded building immediately east of the church, known as Post Office Cottages. This dates from the late 16th or early 17th century and may have been built as the rectory. Part of it was at one time used as a "lock-up".
The most prominent building within High Ongar's Conservation Area is the parish church of St. Mary the Virgin, which is listed Grade I. The church dates from the mid-12th century although it was extended and restored in the 19th century. Thomas Chase (died 1449), former Lord Chancellor of Ireland and Chancellor of Oxford, spent his last years as vicar here.