Clancy died Tuesday in a Baltimore hospital, but his publisher did not disclose the cause of death.
The American author was best known for his Cold War thrillers like "The Hunt for Red October" and "Patriot Games." These novels along with "Clear and Present Danger" and "The Sum of All Fears" have been turned into commercially successful films featuring actors Alec Baldwin, Ben Affleck and Harrison Ford. A fifth movie based on his desk-jockey CIA hero, "Jack Ryan," set for release later this year.
His 17th novel, "Command Authority," is due out that same month from G.P. Putnam's Sons.
Clancy has written 17 No. 1 New York Times bestselling novels. He also has several nonfiction bestsellers including "Into the Storm: A Study in Command" and "Every Man a Tiger."
"He was a consummate author, creating the modern-day thriller, and was one of the most visionary storytellers of our time," said David Shanks, Clancy's publisher at Penguin Group. "I will miss him dearly and he will be missed by tens of millions of readers worldwide.