William H. O'Brien (Peak Hill, Australia, 19 de julio de 1891 – 18 de abril de 1981) fue un actor. En La Butaca Roja figura en 9 películas y 6 series, entre ellas La calumnia, La mujer fantasma y La loba humana.
Funeral Assistant (uncredited)
Hotel Take-Out Delivery Man (uncredited)
Waiter at Party (uncredited)
Constable (uncredited)
Detective at Murder Scene
Scientist (uncredited) (1 episodio)
Waiter (uncredited) (1 episodio)
Delegate (uncredited) (1 episodio)
Audience Member (uncredited) (1 episodio)
Bartender (uncredited) (1 episodio)