Elio Bonadonna was a stuntman and actor who was active in Italian films from at least the start of the 1960's until the late 1980's.
He was the brother of stuntman Giovanni Bonadonna and the brothers often appeared in films together. On his Westerns all'Italiana blog, Tom Betts mentions that Elio was a former boxer and that he owned and operated a gym in Rome where he trained stuntmen - the latter is corroborated by Luca Zanna, an Italian who runs his own gladiator school in the US, and who in a 2004 interview talks about meeting Elio at his gym and being trained by him. He also mentions Elio in a 2001 interview in which he describes him as a "famed fight choreographer for numerous 1950s-'60s sword-and-sandal epics".
Tom Betts also says that Elio died in May 2003, date unknown, and while he doesn't mention a source, Tom's posts are well researched and should be reliable.
He was apparently also a champion of Greco-Roman wrestling during the late 1950's and early 1960's, though there's little information available on this except for some mentions on this website as well as this one.
Additionally, Elio appeared in a few fotoromanzi for publishers Lancio and Condor in the 1960's and 1970's, but unlike his brother Giovanni, who was a regular face in these fotoromanzi, Elio appears to only have made a few sporadic appearances, quite likely as a favor to his brother.
I have found a number of early roles for Elio in peplums and eurospies, but his 60's filmography is still fairly sparse, so I'm certain there must be more roles to be found. It certainly seems a little odd that he currently has no 60's credits in westerns. From the 70's he maintained a beard, giving him a similar look to Emilio Messina (with whom he has been mistaken on occasion).
- Esther and the King .... Soldier wrestling with King Ahasuerus (uncredited)
- La regina delle Amazzoni .... Prisoner of the Amazons (uncredited)
- Barabba .... Gladiator (uncredited)
- Ercole alla conquista di Atlantide .... Tavern brawler (uncredited)
- Rosmunda e Alboino .... Guard (credited)
- Maciste, il gladiatore più forte del mondo .... Gladiator / Tavern brawler in grey / Tavern brawler in orange (uncredited)
- Sodoma e Gomorra .... Sodomite guard at the branding (uncredited)
- Giacobbe, l'uomo che lottò con Dio .... Fighter in the mud (uncredited)
- Maciste, l'eroe più grande del mondo .... Gladiator from Nefer / Soldier on the Sacred Siren (uncredited)
- Gli invincibili dieci gladiatori .... Prison camp guard (uncredited)
- I magnifici brutos del West .... One of Tom's men (uncredited)
- Maciste gladiatore di Sparta .... Fighter with Maciste (uncredited)
- Queste pazze pazze donne .... Thug in disco brawl (uncredited)
- The Visit .... Villager (uncredited)
- Una spada per l'impero .... Gladiator (uncredited)
- Due mafiosi contro Goldginger .... Guard (uncredited)
- La decima victima .... Man at the practice range (uncredited)
- La magnifica sfida .... Tavern brawler (uncredited)
- La meravigliosa Angelica .... Member of Nicolas's band (uncredited)
- A.D.3 operazione squalo bianco .... Fighter in the bar (uncredited)
- Agente 3S3, massacro al sole .... Henchman (uncredited)
- Duello nel mondo .... Nightclub bouncer (uncredited)
- Tutto Totò (TV series) - ep. 6: "Totò ciak" .... One of Lupo's men (uncredited)
- Niente rose per OSS 117 .... Yusuf (uncredited)
- Non cantare spara (TV mini-series) - ep. 4 .... One of the Corbett brothers (credited as "Il team di Musumeci Greco")
- L'oro dei bravados .... Fighter in the tunnel (uncredited)
- Ettore lo fusto .... Member of gay biker gang (credited)
- Ming, ragazzi! .... Football player (uncredited)
- Carambola .... Clydeson henchman (uncredited)
- Il torcinaso .... Henchman (credited)
- La collegiale .... Role-playing "general" with Emy (uncredited)
- La polizia interviene: ordine di uccidere! .... Judo trainee in the gym (uncredited)
- Noi non siamo angeli .... Shark henchman (credited)
- Il conto è chiuso .... Rico henchman (credited)
- Squadra antifurto .... Gorniani henchman (uncredited)
- La via della droga .... Henchman (uncredited)
- Mr. Mean .... Hitman (uncredited)
- Il giocattolo .... Judo practitioner (uncredited)
- La gorilla .... Judo student (credited)
- Monsignor .... 1st killer (credited)
- Hercules .... Challenger of Hercules (uncredited)
- The last days of Pompeii (TV mini-series) - ep. 3 .... Gladiator (uncredited)
- Il pentito .... Mafia killer (uncredited)
- Sicilian Connection .... Mafia assassin (credited)
- Big Man (TV series) - ep. 1: "Polizza droga" .... Thug (credited)
- Ursus gladiatore ribelle (1962) I'm pretty sure Elio appears as a Gladiator, but the prints currently available are awful quality and it would need a better copy to confirm the ID. Brother Giovanni definitely does appear.
- Il commissario Verrazzano (1978) - It looks like it's probably Elio in my images for Pino Mattei playing some role in the pool hall, but really needs a better image to clarify