Robert Todd Lincoln Beckwith (July 19, 1904 – December 24, 1985) was an American gentleman farmer known as a great-grandson of Abraham Lincoln.
In 1975, he became the last undisputed descendant of Lincoln when his sister, Mary Lincoln Beckwith, died without children.
Though Timothy Lincoln Beckwith was born to second wife Annemarie Hoffman Beckwith in the midst of divorce proceedings in 1968, Robert Beckwith contended—and the court agreed—that his paternity was highly unlikely, as he had undergone a vasectomy in the early 1960s.