The Lac de Serre-Ponçon (French pronunciation: [lak də sɛʁ pɔ̃sɔ̃]; Vivaro-Alpine: Lac de Sèrra Ponçon), known in English as the Lake of Serre-Ponçon, is a reservoir on the border between the Hautes-Alpes and Alpes-de-Haute-Provence departments, in the Provence-Alpes-Côte d'Azur region, Southeastern France, one of the largest in Western Europe.

The lake was created to control water flow after disastrous floods caused severe damage and loss of life in 1843 and 1856.

According to the official website of the Muséoscope, the "museum of the largest dam in Europe made of compacted soil", Lac de Serre-Ponçon includes a hydroelectric power plant with a 380 MW generator.

The combined capacity of these linked plants, which totals 2,000 MW, makes a substantial contribution to sustainable power generation and the region's energy landscape.

[citation needed] Within the lake is a small chapel, Chapelle Saint-Michel, which was originally built on a hill in the 12th century, destroyed by the army of Victor Amadeus II, Duke of Savoy in 1692, and rebuilt soon after.