Domingo Tomás Hernández Bethencourt, known professionally as Tom Hernández, was an American theater, films, and television actor, who played supporting roles, usually Hispanics, throughout his career. He was mainly known for their roles in the American film The 3rd Voice (1960), and in the Spanish films "Fuerza Mortal" (1980) and "Tunka, el guerrero" (1983). However, he is best remembered by his interpretation of Don Diego character at the San Diego's fair (California) Del Mar Fair during almost of four decades until his death in 1984. He held the position of goodwill ambassador of the fair, promoting it and he welcomed people that came to the fair with his greeting in Spanish "¡Bienvenidos, Amigos!", greeting for which he was known. He was brother of also actor Pepe Hern and uncle of present-day actor Justin Lopez from The Three Stooges.

The 3rd Voice is a 1960 American neo noir thriller crime drama film directed and written by Hubert Cornfield, who also produced the film with Maury Dexter. It is based on the novel All the Way by Charles Williams and stars Edmond O'Brien, Laraine Day, and Julie London.