Fauja Singh (died 14 July 2025) was a British Indian marathon runner. At the time of his birth in Punjab province in British India, birth certificates were not typically issued, so his age could not be verified by third parties. Later in life, he became a marathon runner, participating in marathons all over the world.

He beat a number of world records in multiple age brackets, but none of his times were ratified as records. His personal best time for the London Marathon (2003) was 6:02, and his marathon best, claimed for the 90-plus age bracket, was 5:40 at the claimed age of 92, at the 2003 Toronto Waterfront Marathon. He died in Punjab in 2025, in a hit and run incident.

At the time of his death in July 2025, Singh was widely reported by international media to be 114 years old, which would have made him the oldest living man in the world and among the oldest men ever. Although his age was not officially verified by Guinness World Records due to the absence of early 20th-century birth documentation, his claimed birth date of 1 April 1911 appeared on official identification documents and was accepted by multiple reputable news outlets, however such outlets likely did not attempt to verify his claim.

Fauja Singh Dhindsa claimed to have been born in Beas Pind, Jalandhar, Punjab, British India on 1 April 1911, the youngest of four children. Singh did not walk until he was five years old. His legs were thin and weak, and he could hardly walk long distances. Because of this, he was often teased, and he was called by the nickname "danda" (Punjabi: ਡੰਡਾ for "stick") for the next ten years. As a young man, Singh was an avid amateur runner, but he gave it up at the time of the Partition of India.

It was only after witnessing the death of his fifth son, Kuldip, in a construction accident in August 1994, that in 1995 Singh returned to his passion for running. The death of his wife in 1992 and his eldest daughter who had died from complications after giving birth to his third granddaughter gave him the determination for this new focus in life. He emigrated to England in the 1990s and lived with one of his sons in Ilford.

At the claimed age of 89, Singh took seriously to running and ended up in international marathon events. When he first turned up for training at Redbridge, Essex, he was dressed in a three-piece suit. The coach had to rework everything, including his attire. Singh ran his first race, the London Marathon, in 2000. According to his coach, he used to run up to 20 kilometres easily and wanted to run a marathon, thinking it to be just 26 kilometres and not 26 miles (42 kilometres). It was after he realised this that he began training seriously.

At the claimed age of 93, Singh completed a marathon in 6:54, 58 minutes quicker than the world best for the 90-plus age bracket. That same year, in 2004, he was featured in an advertising campaign for sportswear manufacturer Adidas alongside David Beckham and Muhammad Ali.

Singh bettered the UK records for the 200 metres, 400 metres, 800 metres, the mile, and the 3000 metres for his claimed age group, all within a single 94-minute period, but they are not currently listed as records.