Arum is a small village in the Dutch province of Friesland. It is located in the municipality Wûnseradiel, about 5 km southeast of the city of Harlingen.
The village itself has about 850 inhabitants. The surrounding countryside that belongs to Arum, including the hamlets of Baarderburen and Grauwe Kat, has a population of about 180.
In 1380, the Battle of Arum was fought near the village between the monks of the monasteries Ludingakerk (near Midlum) and Oldeklooster (near Hartwert), in which more than 130 men died.