Morgan said: “I’m absolutely thrilled to confirm Imelda Staunton as Her Majesty the The Queen for the fifth and final season, taking The Crown into the 21st century.
“Imelda is an astonishing talent and will be a fantastic successor to Claire Foy and Olivia Colman.
“At the outset I had imagined The Crown running for six seasons but now that we have begun work on the stories for season five it has become clear to me that this is the perfect time and place to stop.
“I’m grateful to Netflix and Sony for supporting me in this decision.”
Cindy Holland, Netflix vice-president of original content, said: “The first three seasons of The Crown defined an era, and I know the upcoming fourth season will build further on that success.
“It’s a stunning example of award-winning entertainment, created in the UK and loved by millions of fans around the world.
“I fully support Peter Morgan’s creative decision and am excited to see how he, Imelda Staunton and the cast and crew of Season 5, bring this landmark series to a fitting and spectacular end.”