The First Air Mail Marker is a plaque in West Potomac Park, Washington, D.C.

It is located on east shore of the Potomac River beside Ohio Drive.

The marker commemorates the first regularly scheduled United States airmail service flight.

On May 15, 1918, Lt. George Boyle departed Washington in a Curtiss JN-4H biplane in front of a crowd that included President Woodrow Wilson.

Bound for Philadelphia, Boyle became disoriented and landed in a Maryland field.