Joseph Naylor MBE (10 February 1936 – 28 June 2024) was an English fell runner who set many long-distance records, and a sheep farmer, living in the Lake District. He became known as the "King of the Fells" or simply the "Iron Man".

Joseph Naylor was born in 1936 in Middle Row Farm, Wasdale Head, and attended school in Gosforth, Cumbria, leaving at 15 to work on the family farm.

Injuries in his youth led to operations aged 19 to remove cartilage from his right knee and aged 22 to remove two discs from his back. He took up running in 1960 aged 24, winning his first race, the Mountain Trial, in 1966. In 1971, he completed the Bob Graham Round, only the sixth person to do so, and continued to win races and set records through the 1970s and 1980s.

In 1978, following medical advice that his back was deteriorating, he reduced his farming activities (selling his cattle but retaining his sheep), and took a job training apprentices at Windscale. In his seventies, he started spending winters in Spain, as cold weather caused circulation problems in his legs.

His fell running achievements included successive peak bagging records within the scope of the Bob Graham Round:

His other fell running achievements included:

Naylor married Mary Downie in 1963, and they had three children.

After a period of ill health, including a stroke, Naylor died at a care home in Gosforth, Cumbria, on 28 June 2024, at the age of 88.