Most Oscar awards for acting won by a film
Who
Network (1976), A Streetcar Named Desire (1951)
Where
United States Los Angeles
When
To date, no film has won all four acting Oscars, but in 1952 A Streetcar Named Desire (USA 1951) and in 1977 Network (USA 1976) won three. Nominated for 12 Oscars, A Streetcar Named Desire won five including Best Actress for Vivien Leigh (UK), Best Supporting Actor for Karl Malden (USA) and Best Supporting Actress for Kim Hunter (USA).

Network
won all three Oscars it was nominated for: Best Actor for Peter Finch (UK), Best Actress for Faye Dunaway (USA) and Best Supporting Actress for Beatrice Straight (USA)