Robert Crichton, 4th Lord Crichton of Sanquhar was born between 1515 and 1520. He was the son of Robert Crichton, 3rd Lord Crichton of Sanquhar and Elizabeth Murray.1 He married Elizabeth Campbell, daughter of John Campbell, before 1 December 1534.1 He died before 7 January 1535/36, without issue.1
He succeeded to the title of 4th Lord Crichton of Sanquhar [S., 1488] between 1516 and 1520.