The brief clip, filmed through an open door, shows Colman, in full royal regalia, walking into the frame and then looking into the camera.
Only still images had been seen of Colman in costume until the streaming service shared a 21-second video which features her dressed in a white dress, blue sash and crown.
Written by Peter Morgan and starring Oscar winner Olivia Colman as Queen Elizabeth II, Tobias Menzies as Prince Phillip, Helena Bonham Carter as Princess Margaret, Ben Daniels as Tony Armstrong-Jones, Josh O'Connor as Prince Charles, Erin Doherty as Princess Anne, Marion Bailey as The Queen Mother and Jason Watkins as Prime Minister Harold Wilson, The Crown is a Netflix exclusive.
Colman takes over the role of our reigning monarch from Claire Foy who played Elizabeth Windsor throughout the first two seasons of the show.
The third series covers the years of the British Royal Family between 1964 and 1977. Killing Eve writer Emerald Fennell will play Camilla Shand, now the Duchess of Cornwall, while Gillian Anderson will play British PM Margaret Thatcher.
Earlier this year, it was confirmed Emma Corrin will play Lady Diana Spencer in the fourth series of the drama, which will film this year.
The news of The Crown’s return was announced by Netflix in a very regal manner.
Aping the Royal tradition of making important announcements such as births and engagements on an easel outside Buckingham Palace, the launch date of the third season of the award-winning show was mocked up on a similarly posh frame.
“Dear Public,” the notice reads.
“The official arrival date of the third series of The Crown is as follows: 17th November 2019
“We would like to express deep gratitude to all those involved and we wish the public the most splendid viewing experiences.”
The Crown S3 will land on 17 November.