St Mary the Virgin is a 13th-century Anglican parish church in Northolt, London Borough of Ealing.

It is on a slope shared with Belvue Park, the site of a 15th-century manor house — both overlooked the old village of Northolt.

Twin buttresses were erected against the west wall around 1718 to alleviate concerns that the church could slip down the hill.

The church was constructed from a variety of materials; the nave incorporates clunch (a type of limestone), flint and ironstone, and the mouldings of the doors and windows are made from Reigate Stone.

From the 13th century to 1873 its rector was the Bishop of London, delegating the benefice (living, role as priest) to a vicar during that time.

The chancel and nave roof were rebuilt in the early 16th century, and the square bell turret, which is weather-boarded and finished with a broach spire, dates from the same period.

A wooden gallery of three bays, supported on Doric columns and said to have been constructed in 1703, is built across the west end of the nave.

George Palmer (vicar 1638–43) was sequestered (bankrupted) in 1643 on the grounds that he spoke against Parliament, "enjoyed incestuous relations" with his sister-in-law, and had "deserted" his cure to join the "Royalist Army".

Palmer seems to have enjoyed considerable popularity among the parishioners, who described his successor, Robert Malthus (vicar 1643–61), as "a factious preacher".

The parishioners petitioned Cromwell for his removal, alleging that he was an unsatisfactory speaker, preached against the army in Scotland, and failed to observe national thanksgiving, Malthus retained the living until the Restoration.

[1] The church formed part of the endowment of Walden Abbey (priory), founded by Geoffrey de Mandeville about 1140.

The abbey continued to exercise its rights to it until some time between 1241 and 1251 when the prior's claims were disputed by St. Paul's Cathedral.

According to an early-15th-century source the vicarage was ordained in 1388, but since the first recorded vicars date from the late 13th century, the document referred to is almost certainly the confirmation of an earlier ordinance.

In 1291 the church was valued at £5; the Prior of Hurley still received his annual pension, and no payment to Walden is recorded.

In 1535 Henry VIII through Thomas Cromwell saw all livings' annual value noted, in a compilation named the King's Books, finding it worth £15.

Under the 1835 inclosure award two modest closes: Hedges Meadow and Catherine Mead to the south and east of the house were allotted to the vicar in lieu of common field land, and glebe fell to 44 a.