Nanna Popham Britton (November 9, 1896 – March 21, 1991) was an American woman who gained notoriety as a mistress of Warren G. Harding, the 29th President of the United States.

In 1927, Britton revealed that her daughter, Elizabeth, had been fathered by Harding while he was serving in the United States Senate, one year before his election to the presidency.

Britton decided to write a tell-all book to earn money to support her daughter and to champion the rights of illegitimate children.

[3] She brought a lawsuit (Britton v. Klunk), but she was unable to provide any concrete evidence and was shaken by the vicious personal attacks made by Congressman Grant Mouser during the cross examination, which cost her the case.

Britton's book was among those irreverently reviewed by Dorothy Parker for The New Yorker magazine as part of her famous Constant Reader column, under the title "An American DuBarry".

Even at this time, over a generation later, her daughter and grandchildren would "occasionally be hounded by hateful skeptics" with threats and other unwanted attention that seemed to intensify during presidential election years.