Margaret Lynch Suckley /ˈsʊkliː/ (December 20, 1891 – June 29, 1991) was a sixth cousin, intimate friend, and confidante of US President Franklin D. Roosevelt, as well as an archivist for the first American presidential library.

She was a descendant of the prominent Beekman, Livingston (Scottish) and Schuyler (Dutch) families of New York,[3] as well as John Bowne and Elizabeth Fones Winthrop Feake Hallet.

[9][10] During World War II, Suckley often stayed for long visits at the White House, keeping the president company.

Although Roosevelt is known to have had an affair with Lucy Mercer during World War I, there is no direct evidence that he had a similar relationship with Suckley,[8][11][12] although there was an emotional connection.

Surviving letters include affectionate personal remarks, as well as reports and reflections about the progress of the war and meetings with figures such as Winston Churchill and Joseph Stalin at the Yalta Conference.

[15] The story was also adapted into the 2012 motion picture Hyde Park on Hudson, with Laura Linney as Suckley, Bill Murray as Roosevelt, and Samuel West as King George VI.

[20] Roosevelt biographer Geoffrey Ward wrote of the Hyde Park depiction of events, "It is true that they drove to a hilltop that they loved at some point in 1935, and that something happened on that hilltop.… And it started a long, first flirtatious and then very fond friendship.

[22] Suckley's relationship with Roosevelt was the subject of a historical fiction novel written by her relative, Daisy Chain by Justine Gilbert (Claret Press, 2023).