His biographical details, repeated by all available sources, are that he was born on August 18th 1892 in La Spezia, Italy and that he died on January 20th 1972 in Savona, aged 79. Wikipedia adds that he married actress Fanny Marchiò in 1922.
His known film career begins with several roles in 1932, but since he was already aged 30 then it could be quite possible that there could be earlier roles to be found. He worked steadily in small parts, with uncredited roles in feature films slightly outnumbering the credited ones, for the next 40 years, until his death. He started playing "older" roles while still in his 30's, so the types of roles he played stayed fairly consistent throughout his career. He was a popular choice to play the roles of doctors, a part he played on at least 6 occasions.
I have found a number of undocumented roles for Renato and I am certain there will be more to be discovered.
- La tavola dei poveri .... Associate of the Marquis (uncredited)
- La telefonista .... Emcee at the ball (uncredited)
1934 - Giallo .... Giovanni (uncredited)
1937 - Il signor Max .... Man at party on the cruise ship (uncredited)
1938 - Giuseppe Verdi .... Man seated in the theatre (uncredited)
- L'argine .... Nightclub customer (credited)
1939 - Un'avventura di Salvator Rosa .... Nobleman (uncredited)
1940 - Fanfulla da Lodi .... role? (credited)
- Melodie eterne .... Man at Schubert's palace recital (uncredited)
1941 - Giuliano de' Medici .... Lorenzo's secretary (credited as "R. Navarrini")
- I pirati della Malesia .... Tribal leader (uncredited)
- La corona di ferro .... Minister of the King of the Rose (uncredited)
- Marco Visconti .... Master of ceremonies (uncredited)
1942 - Fra' Diavolo .... role? (uncredited)
- La bella addormentata .... Doctor (uncredited)
- Un colpo di pistola .... Captain Ivanov (uncredited)
1950 - Le sei mogli di Barbablù .... Renato (uncredited)
1951 - Miracolo a Milano .... Giovanni (uncredited)
1953 - La signora senza camelie .... Rinaldi (uncredited)
1954 - Cento anni d'amore .... Train passenger (uncredited)
- I tre ladri .... role? (uncredited)
- Il processo di Mary Dugan (TV movie) .... Patrick Keamey (credited)
- Napoli piange e ride .... Doctor (uncredited)
- Napoli terra d'amore .... role? (credited)
- Pane, amore e gelosia .... Actor (credited)
- Papà Pacifico .... Art gallery director (uncredited)
- Pescatore 'e Pusilleco .... Emilio (credited)
1955 - Cantami ''Buongiorno tristezza!'' .... Notary (uncredited)
- I due compari .... Doorman at the music academy (uncredited)
- Io piaccio .... Doctor (uncredited)
- La ladra .... Doctor (credited)
1956 - Cime tempestose (TV mini-series) E.1 .... Signor Linton (credited)
- Il sogno dello zio (TV movie) .... Funzionario (credited)
- Le schiave di Cartagine .... Fausto Domizio (credited as "Renato Navarini")
- Mi permette babbo! .... Manfredi (uncredited)
1957 - I fidanzati della morte .... Officer at the race track (credited)
1958 - Aprite: Polizia (TV mini-series) E.5: "Un gentiluomo nell'imbarazzo" .... The expert (credited)
- Coriolano (TV movie) .... Citizen (credited)
- Festival della famiglia Gurgià (TV movie) .... Costantino, the servant (credited)
- Vento notturno (TV movie) .... Porter (credited)
1959 - L'alcade di Zalamea (TV movie) .... Sergeant (credited)
- L'arciere nero .... Brother Lorenzo (credited)
- La scimitarra del saraceno .... Omar (credited)
1961 - Capitani di ventura .... Mastino, Duke of Tolfa (credited)
- Gli invasori .... Viking elder (uncredited)
- L'alba dell'ultima sera (TV movie) .... Second citizen (credited)
- Orazi e Curiazi .... Doctor (uncredited)
1962 - I pianeti contro di noi .... Officer (credited)
- Le 4 verità - segment "La lepre e la tartaruga" .... Hotel porter (uncredited)
- Re Manfredi .... Baron Berthold (credited)
- Marte, dio della guerra .... High priest (credited)
1963 - Golia e il cavaliere mascherato .... Don Francisco (credited)
- Il duca nero .... Fortune teller (credited)
- Io Semiramide .... Architect (uncredited)
- La ballata dei mariti .... The thief (credited)
1964 - Ercole contro Roma .... Argeso (credited)
- Giuseppe Verdi (TV mini-series) E.4 .... role? (credited)
- Maciste nell'inferno di Gengis Khan .... Arminia's father (credited)
- Maciste, gladiatore di Sparta .... Sylvia's father (credited)
- Roma contro Roma .... role? (uncredited)
1968 - Una moglie giapponese .... Father Barelli (credited)
1969 - Testa o croce .... Doctor (credited)
1972 - La grande avventura di Scaramouche .... role? (credited)
- Il seppellimento (1960 radio broadcast) credited in Radiocorriere, as Signor Polsey
- Romeo e Giulietta (1962 radio broadcast) credited in Radiocorriere, as Il cugino del Capuleti
- Un cattivo soggetto (1933) ANICA
- Lohengrin (1936) ANICA as Director of the hotel in Vienna
- Fuochi d'artificio (1938) ANICA
- Pietro Micca (1938) ANICA as Agostino di Sale
- Tutta la vita in una notte (1938) ANICA
- Il signore a doppio petto (1941) ANICA
- La maschera di Cesare Borgia (1941) ANICA
- Gelosia (1942) ANICA as Defence lawyer
- Il fanciullo del West (1942) ANICA
- L'ultimo addio (1942) ANICA
- La donna del peccato (1942) ANICA
- La danza del fuoco (1943) IMDb
- La maschera e il volto (1943) ANICA
- Mater dolorosa (1943) Wikipedia
- Tempesta sul golfo (1943) ANICA as Ceremoniere di corte
- Il cappello da prete (1944) ANICA
- L'ombra (1954) ANICA
- Napoleone a Firenze (1964) ANICA
- La cambiale (1959) ANICA with no role. Not found.