Hinton St Mary is a village and civil parish in Dorset, southern England. It is sited on a low Corallian limestone ridge beside the River Stour, one mile north of the market town Sturminster Newton. In 2001 the parish had 97 households and a population of 221. In 2013 the estimated population of the parish was 260. In 2021 the estimated population of the parish has decreased to 225.