Marston St. Lawrence is a village and civil parish about 4 miles northwest of Brackley in Northamptonshire. A stream flows through the village and another forms the southern boundary of the parish. The two merge as Farthinghoe Stream, a tributary of the Great Ouse. The 2001 Census recorded the parish population as 209, decreasing slightly to 202 at the 2011 Census. The villages name means 'marsh farm/settlement'.