The Arda is a torrent of Emilia-Romagna, Italy, nearly all of its course being within the province of Piacenza.

After about 15 kilometres (9 mi), at an elevation of 341 metres (1,119 ft), it is dammed to form the Lago di Mignano reservoir which covers about 2 square kilometres (0.77 sq mi) and provides both a water supply and hydro-electric power.

Before entering the Po, near Polesine Parmense, it is joined on the right by another torrent, the Ongina, whose source is in the Piacenza hills, between Alseno and Castell'Arquato.

The Arda follows the typical pattern of an Apennine torrent with maximum discharges during the spring and autumn rains and a minimal flow during the summer.

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