The actor won the award for 'Best Performance by an Actor in a Motion Picture-Drama' at the 2018 Golden Globes for his portrayal of Winston Churchill in the film.
During his speech, the actor said, "Well, I feel very humbled and surprised to have been asked to come at this stage. I would like to congratulate my fellow nominees for their beautiful work. I am in very fine company this evening indeed."
But when asked about the Time's Up movement that dominated the evening backstage, Oldman said, "When the curtain came down on Harvey [Weinstein], I was flabbergasted. Fortunately he was never in my orbit. I met him in '92 and he gave me the creeps. And I said, 'Let's never work with that guy.' And I never did. The evolutionary wheel is turning. What we do, what we say, how we say it and who we say it to, is very important. If that is exposed, then it is a good thing."
The 'Tinker Tailor Soldier Spy' also discussed the challenge of playing a real-life figure.
He added, "I am proud of the movie because it shows and illustrates the power of words and action. That words and actions can literally change the world."
The actor beat out Timothee Chalamet ('Call Me by Your Name'), Daniel Day-Lewis ('Phantom Thread'), Tom Hanks ('The Post') and Denzel Washington ('Roman J. Israel, Esq.').
Meanwhile, Frances McDormand received the award for 'Best Actress in a Motion Picture, Drama' at the star-studded event. From the moment she walked on stage, the star warned the fans that this was going to be a speech to remember.
She started by saying, "Well I have a few things to say. I'm going to keep it short because we've been here a long time and we need some tequila. All you ladies in this category, bar, tequila's on me."
The actress then joked that while she's thankful for the HFPA, she is 'unsure' about who they truly are.
"I'm still not quite sure who they are when I run into them, for the last 35 years, but I love seeing their faces and, let's face it, they managed to elect a female president," explained McDormand.
McDormand also took the opportunity to mention the Times Up movement and said she felt really proud to be a part of this "tectonic shift" in the industry.
"Some of you may know, I keep my politics private, but it was really great to be in this room tonight and to be part of a tectonic shift in our industry's power structure. Trust me, the women in this room tonight are not here for the food. We are here for the work," explained McDormand.