Thrilling forum

Il ladro della Gioconda (1966) credited as Renato Terra, as Train conductor

Missione sabbie roventi (1966) as Tavern customer

Destinazione Sanremo (1959) credited as Renato Terra, but not found, so it looks like yet another credit only for Renato

Delitto quasi perfetto (1966) as Police agent

Romeo and Juliet (1968)

He appears in both the big street fight scenes. At the first he appears to be neutral but at the second he is obviously a Capulet. He seems to have been a favourite of director Franco Zeffirelli, having also appeared in La bisbetica domata, Fratello sole, sorella luna and Jesus of Nazareth.

I coltelli del vendicatore (1966) credited in some versions as Rodney Terra. Does not appear. Credit found by FatmanDan

Un uomo facile (1959) credits ?, photo picture, Role unknown, to be confirmed
Found this on the Italian website Ivid.com
Renato is seen in the centre of the picture
Thanks to Nick for the screenshot !
It's a movie about two rival boxers

Sette contro la morte (1964) as Partisan who fetches the gun

Lupi nell' abisso (1959) as Submarine crew member.

I'm certain this is Renato in the centre, however his appearance in the film is rather odd. The entire film takes place on board a submarine with a necessarily limited cast who are seen throughout the film. Renato, however, is seen briefly in an opening scene, but then mysteriously does not appear again. Does he get killed when the submarine is hit by a bomb but is never found? Is he a ghost? Only the film-makers know for sure!

Mio figlio Nerone (1956) as Courtier