Marc Anthony Donais is an American actor who performed in gay pornographic movies in the 1990s and later onstage in mainstream theater. He has French, Irish, and Native-American ancestry.

He describes himself as "the creation of Marc Anthony Donais." In February 1989, Marc appeared as the "Man of the Month" centerfold in Playgirl under his birth name Marc Anthony Donais. This appearance launched his modeling career and introduced him to the adult film industry, in which he achieved notoriety and success under the name Ryan Idol.