The A Single Man star, who was recently nominated for a Golden Globe and a Screen Actors Guild award, joked that he has now changed his mind.
"When I was young, I remember being quite militant about these things," he told the Daily Record. "I said there should not be awards. Well, now I have changed my mind about all that. They are a very good thing!"
Firth added that he was particularly honoured to win the best actor award at the Venice Film Festival because his wife Livia is Italian.
"Winning in Venice was absolutely fantastic," he said. "It was a very special thing as far as I was concerned, not least because I have such an Italian strand in my life. And I was able to say 'thank you' in Italian."
> Click here to watch the trailer for A Single Man