St Mary is one of the twelve parishes of Jersey, Channel Islands. It is 7.7 kilometres north-west of St Helier. It is the smallest parish by surface area, with an area of 3,604 vergées. The parish is rural, with a low population of only 1,818 in 2021, with a single sparse village. It borders four other parishes: St Ouen, St John, St Peter and St Lawrence.