Tilshead is a village and civil parish in the county of Wiltshire in Southern England, about 9 miles (14 km) northwest of the town of Amesbury. It is close to the geographical centre of Salisbury Plain, on the A360 road approximately midway between the villages of Shrewton and West Lavington and is near the source of the River Till. Its population in 2011 was 358, down from a peak of 989 inhabitants in 1951.