The Battle on the Planta, fought on 13 November 1475 around Conthey near Sion, Valais, Switzerland, was part of the Burgundian Wars.

In the 13th and 14th centuries, the Upper Valais (the eastern portion of the valley, higher in the mountains) was colonized by Germans from Hasli in the Canton of Bern.

Led by the Bishop of Sion Walter Supersaxo the Upper Valais forces began attacking Savoy holdings.

On 13 November the Bishop's forces together with unexpected reinforcements from Saanen, the Simmental, Fribourg, and Solothurn defeated the Savoy counterattack near Conthey to the west of Sion.

[3] Following the Savoy defeat at the battle, the bishop's army marched west conquering the Lower Valais as far as Saint-Maurice and capturing a total of 17 Savoyard castles.