Peter Randolph Louis Beatty (2 April 1910 – 26 October 1949) was an English racehorse owner and breeder, businessman and member of the .
Born on 2 April 1910, Beatty was the younger son of David Beatty, 1st Earl Beatty and his wife Ethel. An heiress in her own right, Beatty's mother was the only daughter of Marshall Field, an American millionaire who was involved in the department store business in Chicago. His mother's death in 1932 made Beatty a millionaire. As a baby Beatty suffered from ophthalmia neonatorum. It affected his eyesight and personality throughout his life; he was frequently high-strung, and his eyesight gradually deteriorated. Beatty had consulted with eye specialists in the UK and the US and also had many eye surgeries; none were able to offer him any improvement for the condition.
Beatty was described as having a shrewd business sense, particularly when it came to horses and horse racing. He was also said to be witty and at times, mischievous. Despite his failing eyesight, Beatty managed to obtain a commission in his father's old unit. He served with the company in the Middle East until his secret was discovered and he was honourably discharged from service. He was a tall, dark and handsome man who had once been named one of Britain's most eligible bachelors. At the time of his death Mereworth Castle in Kent was his main residence.Aly Khan and his wife, Rita Hayworth, were Beatty's guests at the castle for the running of the Epsom Derby in June 1949.
Beatty's nickname was "Lucky" because of the success he had enjoyed at an early age in horse racing. He told friends that he had consulted a fortune teller, who told him he would win the Epsom Derby with a horse whose name had three "s" in it; four years later, Beatty's Bois Roussel won the race. In 1936 Beatty inherited Reigate Priory, the last private individual to own the property, and added stables to the grounds for his racehorses. He sold the property to the Mutual Property Life and General Insurance Company in 1942. Beatty was also involved in horse breeding; the noted racehorse My Babu was bred by Beatty.