Don Robertson (March 21, 1929 – March 21, 1999) was an American novelist. He wrote 18 published novels. Robertson is probably best known for his trio of novels featuring Morris Bird III: The Greatest Thing Since Sliced Bread, The Sum and Total of Now, and The Greatest Thing That Almost Happened. A movie adaptation of The Greatest Thing That Almost Happened aired on NBC in 1977, starring Jimmie Walker and James Earl Jones.