Wellow is a village and civil parish in Hampshire, England that falls within the Test Valley district. The village lies just outside the New Forest, across the main A36 road which runs from the M27 motorway to Salisbury. The nearest town is Romsey, 4 miles to the east, and the closest city is Southampton, 9 miles to the southeast. The parish had a population of 3,239 in the 2021 census.