Langley Marish, or Langley, is a large village to the immediate E of Slough and contiguous with it. It was part of Buckinghamshire until 1974, when it was transferred as part of Slough to Berkshire, and in 1998 when Berkshire ceased to exist as a unit of local government, Slough became a Unitary Authority. The church has retained its extensive graveyard; unusual in its urban setting. It consists of a chancel with a N chapel, a nave with a N aisle open to the chapel, the raised 17thc Kederminster chapel for the Harvey family on the S side of the nave, with a library on the W side of it, occupying the former S porch, a brick NW tower of 1609 (i.e. at the W end of the N aisle) and a modern brick block on the N side, acting as a porch to the N doorway and a lavatory block. Construction of the parts not built of brick is of flint and stone. The nave is 12thc (see the herringbone flintwork of the W end), and the chancel and the N chapel are 14thc. The aisle was added in the 12thc, and the W bay of the 4-bay arcade is still Romanesque. The other 3 bays were replaced in 1630 by a spectacular wooden trabeated colonnade of 3 bays, with paired slender shafts carrying Doric capitals. Features described here are the W bay of the nave arcade and a chip-carved stone now set in the N wall of the nave.

Langley Marish is not mentioned specifically in the Domesday Survey, but must have been included in the 20-hide manor of Wyrardisbury (Wraysbury), held by Robert Gernon in 1086 and by King Edward's thegn Edmund in 1066. When Gernon died without an heir, his lands were given by Henry I to William de Muntfichet of Stansted Mountfitchet (Essex). It remained in this family until the death of Richard in 1268. His heirs were the descendants of his three sisters, Margery, Aveline and Philippa, and the manor of Wyrardisbury with Langley Marish passed to the heirs of Aveline, who had married William de Fortz. Their granddaughter Aveline was given in marriage by the King Henry III to his second son Edmund Earl of Lancaster in 1269. The manor was leased in 1282 to Christine de Marisco, hence the suffix Marrish appled to the name.

The church of Langley Marrish was annexed to Wyrardisbury as a chapelry in the 1st half of the 12thc, and remained in this position until 1856 when it became a benefice in its own right.

Pevsner (1960) called this 'one of the most rewarding churches of Buckinghamshire, a great surprise in the immediate neighbourhood of Slough'. The RCHME inventory dates the Norman nave before 1150, based on the masonry, which would suit the date of the chip-carved stone, and the arcade to c.1180.