Rehmatullah "Rehmat" Khan (sometimes spelled Rahmat Khan or Rhamat Khan) is a squash coach and a former squash player from Pakistan. He coached his cousin Jahangir Khan throughout his career. The partnership led to Jahangir winning 10 British Open titles and a spectacular winning streak of 555 consecutive matches.

Rahmat was among the leading squash players on the international circuit in the late-1970s, reaching a career-high ranking of World No. 12. He was a close friend of Torsam Khan, Jahangir's older brother, who was among the top professional players. In 1979, Rahmat and Torsam, who both saw the potential in young Jahangir, made plans to buy a 50% share in a Sussex squash club and bring Jahangir to England to train. However, just when the deeds were to be signed, Torsam suffered a heart attack during a tournament match in Australia and died suddenly.

At that point, Rahmat made a decision to sacrifice his own playing career to take on the challenge of coaching the enormously promising youngster Jahangir. He commented at the time: "I was No. 12, but because of constant injuries I didn't think I would climb any higher." Jahangir had considered quitting the game in the wake of his older brother's death, but Rehmat helped to convince him that Torsam would have wanted him to continue. Rahmat convinced Jahangir's family to let him come to England to train.