Coordinates: 43°30′43.48″N 6°45′23.40″E / 43.5120778°N 6.7565°E / 43.5120778; 6.7565

Malpasset was an arch dam on the Reyran River, constructed approximately 7 km north of Fréjus on the Côte d'Azur, southern France, in the Var département. It collapsed on December 2, 1959, killing 421 people in the resulting flood. Various sources indicate death numbers of 361, 400, 423, 429 or 510. The damage amounted to a total of $68 million.

The dam, which was a doubly curved equal angle arch type with variable radius, began construction in April 1952 and finished in 1954 to supply water and irrigation for the region. Delays due to lack of funding and labor strikes halted construction a few times. Another source reports that construction began as early as 1941. Construction cost 580 million francs (by 1955 prices), and was led by well-known French engineer André Coyne. The project was funded and owned by Var département. Concurrent with the dam construction, the A8 autoroute was also being built 200 meters away from the dam location.