Vice President Joe Biden led the list of mourners at the funeral of the legendary journalist, who died on October 21 at the age of 93.
Bradlee is best remembered for steering the Post's Watergate coverage, a series of scoops revealing White House skullduggery that led to the 1974 resignation of president Richard Nixon.
"He was an original of his own creation, different from everybody else in his newsroom," wrote Watergate reporters Bob Woodward and Carl Bernstein in a tribute in today's edition of the Post.
Woodward and Bernstein were among those lined up to deliver tributes at today's service as well as members of the Bradlee family.
The list of pallbearers and ushers read like a who's who of contemporary US journalism. The cathedral said 2,000 mourners had come to pay their respects.
Gary Hall, the Anglican dean of the National Cathedral, was presiding.