The Doctor is an 1891 painting by Luke Fildes that depicts a Victorian doctor observing the critical stage in a child's illness while the parents gaze on helplessly from the periphery. It has been used to portray the values of the ideal physician and the inadequacies of the medical profession. Different theories exist as to the painting's origin but it is most likely based upon Fildes' own experience of the death of his son. Critics have noted that Fildes omitted common medical equipment of his era in order to focus on the relationship between physician and patient.

Sir Samuel Luke Fildes was a British painter and illustrator born in Liverpool and trained at the South Kensington and Royal Academy Schools. He was the grandson of the political activist Mary Fildes.