It’s the first time the streaming giant has revealed viewing data for the series about the British monarchy.
The third season, which stars Olivia Colman as the Queen, was watched in 21 million homes in its first four weeks.
That was 40% more than saw the second season over the same time period, Netflix said.
The company’s chief content officer Ted Sarandos said the figures proved The Crown’s “popularity grows with each new season”.
Colman replaced Claire Foy as Queen Elizabeth II after the second season.
“Seventy-three million households around the world have made The Crown part of the global cultural zeitgeist,” Sarandos said.
On Tuesday, Netflix also announced that new fantasy drama The Witcher was watched by 76 million households in its first month. The show, about a mutated monster hunter, gave Netflix its best result yet for a first-season original TV series.
Meanwhile, the second season of You was watched by 54 households, and Michael Bay’s action thriller film 6 Underground, starring Ryan Reynolds, was seen by 83 million.
Netflix has previously revealed viewing data for Orange is the New Black reached 105 million homes over its first six seasons.