Billed as a "fresh and contemporary take" on Alexandre Dumas's classic novel, the drama stars Skins actor Luke Pasqualino as D'Artagnan.
The 23-year-old is seen at the forefront of the newly released image, alongside Merlin's Santiago Cabrera (Aramis), The Hour's Tom Burke (Athos) and theatre actor Howard Charles (Porthos).
Filming has recently wrapped on the ten-part series from Primeval co-creator Adrian Hodges, which is set to launch in early 2014.
Hodges said: "I'm thrilled we can finally release the first image since wrapping filming on The Musketeers. I hope the picture gives a good idea of the look and intensity of the Musketeers themselves, and a hint of the excitement of each powerful, dramatic and action-filled episode."
Upcoming Doctor Who star Peter Capaldi will also feature in the series as the shadowy Cardinal Richelieu.
Hodges has admitted that he was shocked by Capaldi's casting as the 12th Time Lord, and appeared to confirm that the actor's commitments to the sci-fi show could rule him out of appearing in a potential second series of The Musketeers.
The series was featured in a recent preview video of the BBC's upcoming dramas, alongside Sherlock, Quirke, What Remains, Ripper Street and By Any Means.
Watch the BBC's Original British Drama trailer below: