The Bormida (Bormia in Piedmontese language) is a river of north-west Italy.

The hydronym Bormida derives from the pre-Roman Ligurian proto-form *bormo ('warm or bubbling water'), also linked to the names of the gods of the springs Bormō and Bormānus.

Similar hydronyms are present in the region: the river Borbera and the river Borbore, but also the town of Bormio in Lombardy know since the ancient times for the thermal waters and the town of Burbons les bains in France known for the same reason.

After converging with the Bormida di Spigno near Bistagno it joins the Tanaro, of which it is the major tributary, north-east of Alessandria.

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