Alberto Dell'Acqua (born 14 May 1944) is an Italian actor and stuntman. He appeared in more than forty films since 1955 mostly Italian Spaghetti Westerns, frequently performed under the pseudonyms Robert Widmark, Cole Kitosh, Al Waterman and Albert Nova.

Dell'Acqua was born into one of Italy's most prestigious traditional circus families, part of a multi-generational dynasty that operated renowned shows such as the Royal Circus and Circo Demar. The son of Marcello Dell’Acqua, he grew up alongside siblings including Arnaldo, Roberto, and Ottaviano, all of whom moved fluidly between circus performance and careers in film as actors or stuntmen. From a young age, Dell’Acqua became an accomplished circus performer himself, working as an acrobat, trapeze artist, and juggler, and frequently serving as the “straight man” for his brother Arnaldo, a well-known circus clown. This rigorous and diverse physical training laid the athletic foundation that would later enable his successful transition into stunt work and action cinema.

Dell'Acqua’s entry into the film industry was incidental. He was discovered by the renowned weapons master Freddy Unger, who hired him after Dell'Acqua helped him with circus equipment for a production. His first credited acting role was in Giants of Rome (1964) directed by Anthony Dawson.

His breakout role came in Seven Guns for the MacGregors (1966), where he used the stage name Albert Waterman. Director Franco Giraldi, who had previously met Dell'Acqua while working as an assistant director on the documentary I Malamondo, specifically sought him out for the role.

This led to a lead role in Texas, Addio, playing the younger brother of Franco Nero. The two actors developed a lifelong friendship during the production. During this period, producer Manolo Bolognini briefly imposed the pseudonym Cole Kitosh on him, though Dell'Acqua felt the name did not contribute to his success. In the film, he portrayed the naive and idealistic younger brother of Sheriff Burt Sullivan (played by Franco Nero). His character stubbornly accompanies Burt on a journey to Mexico in pursuit of the sadistic bandit Cisco Delgado. (José Suárez), aiming to avenge their father's murder. As the brothers become entangled with a group of Mexican revolutionaries, the story builds toward a violent and emotionally charged climax. Dell'Acqua's performance received positive attention from reviewers; in a retrospective review of the Blu-ray release, Fanboy Destroy wrote: "It’s all Nero’s show, but Dell’Acqua’s athletic stunts and striking good looks make him a pretty decent co-star."

In 1968, Dell'Acqua collaborated once again with his on-screen brother, Franco Nero, in the film Man, Pride and Vengeance, directed by Luigi Bazzoni. This film is a Western adaptation of the novella Carmen by Prosper Mérimée. During filming, on a particularly scorching day in Spain, Dell'Acqua lay down to rest about half an hour before a scheduled break. When the break began, Nero called out to him to join the crew. However, Dell'Acqua was not merely asleep; he had suffered a heatstroke. Fortunately, Nero quickly recognized the seriousness of the situation and took him to the hospital, ultimately saving his life.

In 1970, Alberto Dell'Acqua appeared in the Italian Spaghetti Western Fighters from Ave Maria (I vendicatori dell’Ave Maria), directed by Bitto Albertini. The film is set during the California Gold Rush and combines elements of action and comedy within the Western genre, following a troupe of circus acrobats who become embroiled in the struggles of a small frontier town. Dell'Acqua portrays Pete Garrison, one of the Garrison brothers and a member of the traveling circus troupe whose acrobatic skills and courage aid the inhabitants of the town of Goldfield against the oppressive landowner Parker.

Dell'Acqua transitioned to leading man status, adopting the name Robert Widmark. He famously replaced an American actor in Alleluja & Sartana are Sons... Sons of God (1972) directed by Mario Siciliano because the original lead lacked the athletic ability to perform the fight scenes. The film was a major commercial success in Germany, earning Dell'Acqua a special industry award.