John William "Bud" Rogan (c. 1865-68 – September 12, 1905) is one of 17 known people in medical history to reach a height of 8 feet (2.44 m) or more and also the second tallest person ever recorded, after Robert Wadlow.

He was born in Sumner County, Tennessee, between 1865 and 1868, the fourth of twelve children, fathered by former slave William Rogan. His mother might have not been William Rogan's wife and his mother's name remains unknown. Rogan began to grow very rapidly at the age of 13, leading to ankylosis. Having been able to walk only on crutches, by 1882, he could not stand or walk. By 1899, he had grown to a height of 8 ft 6 in (2.59 m) and often appeared in newspapers, referred to as the "Negro giant". He got around on a goat cart he had made for himself and was always the center of attention, often noted for his extremely deep voice and playful attitude. Although he could not work, he made a living by selling portraits and postcards of himself at the train station. He refused all offers to join the carnival and side shows.

Shortly before developing ankylosis, Rogan was 8 feet 6 inches (2.59 m) tall and weighed 300 lbs. The disease hindered and eventually ended his ability to walk, eventually prompting the use of the goat cart.

His hands measured 11 inches (28 cm) in length and his feet measured 13 inches (33 cm) in length. He continued to grow until his death; his exact height was not measured until after his death. At that time he measured 8 ft 9 in (2.67 m) tall, but weighed only 175 pounds (79 kg), making him the tallest person of African descent, and the second tallest person ever recorded, exceeded only by Robert Wadlow.

Rogan died in 1905 from complications of his disease. His body was buried in the family yard under solid concrete to prevent anyone from exhuming and examining his body.