Mario Monticelli (16 March 1902, Venice – 30 June 1995, Milan) was an Italian chess player.
He was awarded the International Master (IM) title in 1950 and the Grandmaster title honoris causa (GME) in 1985.
In 1922, he won in Rome (ITA-ch Univ).
In 1925, he won in Bologna.
In 1926, Monticelli tied for 1st with Ernst Grünfeld in Budapest.