John Gustaf Lindberg (June 22, 1884 – November 23, 1973) was a Finnish ophthalmologist who was the first to describe exfoliation syndrome, an age-related degenerative disease of the eye that often complicates glaucoma and cataract surgery, in his doctoral thesis that he wrote in St. Petersburg and defended in March 1917 in Helsinki, Finland, at that time a Grand Duchy in the Russian Empire.