Aregno (Corsican: Aregnu) is a commune in the Haute-Corse department on the island of Corsica, France. The village was previously part of the piève of Aregnu in the former Genovese province of Balagna.

The commune has been awarded three flowers by the National Council of Towns and Villages in Bloom in the Competition of cities and villages in Bloom.

Aregno is located immediately to the east of Algajola and extends from west to east between Algajola, Lavatoggio, Cateri, Sant'Antonino, Pigna, and Corbara. Its highest point is 326 metres above sea level and it has a total area of some 930 hectares. Access to the commune is by National Route N197 from Algajola in the west and continuing to Corzo to the north-east. Access to the village is by road D551 which branches off the N197 and continues south through the commune by a circuitous route to the village. There is also the D151 road from Pigna in the north-east, passing through the village and continuing south to join the D71 south-east of Cateri. The CFC railway from Algajola passes through the commune near the beach with the Aregno-beach station an important stop for the summer "beach tramway" along the coast and the beaches between Calvi and L'Ile-Rousse.

Between the sea and the village, the Aregno plain is crossed by the Teghiella stream, which joins the Pozzi stream, and the Migliani stream later on. It flows into the Mediterranean at the east end of Aregno beach, at the edge of the Calcinaiu Natural Site in Corbara.

Aregno has a narrow sea front, mostly sandy beach, which extends between Corbara and Algajola.

The commune includes the following inhabited areas:

Although it has a coastline, the commune has no marina. The nearest is the small fishing port of San Damiano in Algajola.

There are 3 water treatment plants: in the village of Aregno and in the hamlets of Praoli and Torre. The pumping station is located near the N197 at Aregno beach.