Mario Stoppani (24 May 1895 – 20 September 1959) was an Italian World War I flying ace credited with six aerial victories.

Post World War II, he worked for Breda and SIAI Marchetti.

Flying a Nieuport 11, he scored his first aerial victory on 9 July 1916, sharing it with Luigi Olivari.

He was recommended for a second Silver Medal for Military Valor in November; that same month he was asked to become a test pilot for Ansaldo.

He then became the chief test pilot for CANT aircraft company until mid-World War II, circa 1943.

[2] He still holds the distance record for a seaplane in a closed circuit; in 1937, he covered 3,231 miles without landing, piloting a CRDA CANT Z.506.