Saint Mary is one of the twelve parishes of Jersey, Channel Islands. It is 7.7 kilometres (4.8 mi) north-west of St Helier.

The parish is rural, with a low population of only 1,752 in 2011, with a single sparse village. It borders four other parishes: Saint Ouen, Saint John, Saint Peter and Saint Lawrence.

The Jersey parish system has been in place for centuries. By Norman times, the parish boundaries were firmly fixed and remain largely unchanged since.

The parish and its eponymous church derive their name from a medieval monastery, probably destroyed during Viking raids some time between the 8th and 10th centuries. In 1042 Duke William gave "Saint Mary of the Burnt Monastery" to the abbey of Cerisy.

In 1180 Jersey was divided by the Normans into three ministeria for administrative purposes. St Mary was part of Crapoudoit. Crapoudoit likely refers to the stream running through St Peter's Valley.

St Mary's Village is the main settlement in the village. It is formed around a box of sorts of main roads with link roads in between. The village's amenities are formed roughly in three clumps: the parish hall, rec centre and primary school; the parish church, cemetery and pub; and the petrol station. There is also a Methodist church.

The village has a blanket 20 mph speed limit, introduced in 2015. Previously, there had been a 30 mph limit on the southern main road and a 20 mph on the northern main road. The village has extensive traffic calming, including raised junctions, filtered permeability, virtual footpaths and build-outs. The village won the Chartered Institution of Highways and Transportation award for traffic calming measures introduced in the parish in the 2010s.