- From 1970 to 1974 he had an intense relationship with french actress Catherine Deneuve. She was at his bedside when he died, along with their daughter, Chiara Mastroianni.
- When Mastroanni died in 1996, the Trevi Fountain in Rome, associated with his role in La Dolce Vita (1960), was symbolically turned off and draped in black as a tribute.
- His three Oscar nominations for Divorce Italian Style (1961), A Special Day (1977), and Oci ciornie (1987) are the record for a performer in a foreign language film. The only other performers with multiple Oscar nominations for foreign language films are Sophia Loren, Liv Ullmann, Isabelle Adjani, Javier Bardem and Marion Cotillard with two each.
- Told interviewers that Federico Fellini hired him for La Dolce Vita (1960) because he had a "terribly ordinary face".
- Since 1998, a "Marcello Mastroianni Award" is given to the best "first time" young actor/actress at the Venice Film Festival.
- Federico Fellini nicknamed him "Snaporaz" while they are working on La Dolce Vita (1960); 20 years later this was the name of the character he played in City of Women (1980).
- Lived with Faye Dunaway from 1968 to 1970. Dunaway wanted Mastroianni to give her a child but only under the condition that he divorce Flora Carabella first. He refused, so she broke up with him.
- In 1976, estranged wife Flora Carabella reportedly offered to adopt Chiara Mastroianni because Deneuve's career kept her away so often.
- During his studies at the Centro Universiatio Teatrale, he got to know Luchino Visconti, who gave him a role in "Un Tram che si chiama desiderio" (A Streetcar Named Desire) under his direction. At that time, he also met Anna Magnani and Federico Fellini.
- He is buried in the Cimitero Monumentale del Verano in Rome, Italy.
- Father of Barbara Mastroianni and Chiara Mastroianni.
- Older brother of film editor Ruggero Mastroianni, who edited several of Marcello's films directed by Federico Fellini
- Per a Mastroianni biographer, his mother revealed shortly before her deathbed that she was a Jewish immigrant from Belarus, a heritage she had previously hidden.
- Mastroianni's will stipulated that all personality rights would be given to Anna Maria Tatò.
- Along with Dean Stockwell and Jack Lemmon, he's one of a few actors who had won twice the Best Actor prize at the Cannes Film Festival.
- Appeared in 11 films that were lined-up for the Palme D'or at Cannes through the years: La Dolce Vita (1960), Divorce Italian Style (1961), The Pizza Triangle (1970), The Big Feast (1973), A Special Day (1977), La terrazza (1980), The Skin (1981), That Night in Varennes (1982), Oci ciornie (1987), Splendor (1989) and Three Lives and Only One Death (1996). Of those, only La Dolce Vita (1960) won as Best Film while The Pizza Triangle (1970) and Oci ciornie (1987) earned him Best Actor accolades.
- By 1964 Marcello and Flora Carabella informally separated. The separation was formal by 1970, but they never divorced.
- Two funeral services were held for Mastroianni. The first was at the Church of Saint-Sulpice in Paris on Dec. 20, 1996. His coffin was then transported to Rome where a second service was held Dec. 22 at the Verano cemetery.
- On August 30, 2018, he was honored with a day of his film work during the TCM Summer Under The Stars.
- Uncle of Francesca and Federica Mastroianni.
- Commander of the Order of Merit of the Italian Republic (Rome, 27 December 1967), Grand-Officer of the Order of Merit of the Italian Republic (Rome, 27 April 1987), Knight of Grand-Cross of the Order of Merit of the Italian Republic (Rome, 16 March 1994).
- He was the partner of director Anna Maria Tatò from 1976 to his death (1996).
- Former father-in-law of Benjamin Biolay.
- Shares a birthday with A Very Private Affair (1962) co-star Brigitte Bardot.
- Grandfather of Milo Thoretton and Anna Biolay.
- Son-in-law of Ezio Carabella.
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