St Peter is one of the twelve parishes of Jersey in the Channel Islands. It is around 6.5 kilometres (4.0 mi). The parish has a population of 5,003. It has a surface area of 10.6 square kilometres (4.1 sq mi).

It is the only parish with two separate coastlines, stretching from St Ouen's Bay in the west to St Aubin's Bay in the south, and thereby cutting St Brelade off from other parishes. It also borders St Ouen and St Mary to the north and St Lawrence to the east. A large portion of the parish is occupied by Jersey Airport.

The traditional nickname for St. Pierrais is ventres à baînis (limpet bellies), perhaps because their parish sticks to two coasts like limpets.

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 church was built by at least 1053. There are two bells called Elizabeth and Mary, dated to 1649 and 1754 respectively. There is an ancient unique custom in the parish to ring out the bells continuously on Christmas Eve and Christmas Day. It is dedicated to St Peter in the desert.

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