Arenal d'en Castell is a small town in Es Mercadal, Menorca. It is also a start/arrival point for two stages of the GR 223 - Camí de Cavalls.

The town has a long sandy beach and is built around the sides of the bay overlooking the sea. It mainly consists of vacation villas and apartments with a few larger hotels.

Commercially it has four small Spar super markets and a number of bars and restaurants, including an Australian bar, Japi's, an Irish Pub, and Kane's Bar.