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"Isadora" premiered at the 1968 Cannes Film Festival where it competed for the Palme d'Or with Redgrave winning the Best Actress Prize. The film was theatrically released on 18 December 1968 by Universal Pictures to generally positive reviews with major acclaim drawn towards Redgrave's performance, however the film underperformed at the box office grossing mere $1.25 million on a $1.7 million budget. For her performance, Redgrave won the National Society of Film Critics Award for Best Actress and received nominations for the Academy Award for Best Actress and the Golden Globe Award for Best Actress in a Motion Picture – Drama.