Alnham is a hamlet and civil parish in Northumberland, England. It is about 14 miles (23 km) west of Alnwick, about 6 miles (9.7 km) from Scotland and is located on the south of a small tributary of the River Aln. The village stands on uneven ground, sloping from south to north, at the foot of the southern outliers of the Cheviot Hills. The River Aln flows eastward through the village from its source in the Cheviot Hills down to the coast. The layout of the village appears to have been dictated by the river. The estimated population taken at the 2011 Census was around 245.

The River Aln runs through the county of Northumberland in England. It rises in Alnham in the Cheviot Hills and discharges into the North Sea at Alnmouth on the east coast of England.