Alton Pancras is a small village and civil parish in the West Dorset district of Dorset, England. The village is sited at an altitude of 125 metres in the valley of the River Piddle, which has its source just to the north. The surrounding chalk hills rise to between 230 and 260 metres. The broadcaster and agriculturist Ralph Wightman, who was born and lived in the nearby village of Piddletrenthide, described these surrounding hills as "very much in the centre of Dorset".
The village is situated on the B3143 road, which connects it to the county town of Dorchester to the south. Other local travel links include Maiden Newton railway station to the south-west, and Bournemouth International Airport to the east. In the 2011 census the civil parish had 72 dwellings, 71 households and a population of 175.