Nathaniel "Nat" Muir (born 12 March 1958) is a retired Scottish runner from Salsburgh North Lanarkshire who took up athletics in 1970 while at primary school in Chapelhall. He was encouraged by his fellow pupils to join the Shettleston Harriers running club, and his first race was the Lanarkshire Relays in 1970, which saw him earn the fastest individual time in his age group.
Muir's career has seen some ups and downs and he has been described as, "One of Scotland's best ever distance runners: possibly also one of the country's unluckiest in that he never had the success at the very topmost level that his ability and dedication deserved".
Muir ran in many competitions throughout his career from his humble beginnings in 1970 spanning over twenty years, with some notable successes such as his 5th win at the 1984 Irvine Beach Park with his last race concluding in 1992-93 season on the Glasgow-Edinburgh run where his team came in 7th with a recurring Achilles tendon injury.
Muir knew that with the injury his time had come to retire, a decision not brought on by team performance but by his knowledge of his personal limitations to his own fitness and a previous race the Allan Scally Relay as a gauge for the upcoming Glasgow-Edinburgh run.
A personal quote confirms this belief as he has been quoted as saying, "Athletics is essentially an individual sport with a team element coming second to that. No one can gainsay that".
It is believed that Muir still takes an interest in running and has been known to go to cross country championships to spectate.
- Shettleston Harriers running club