Duke Paoa Kahinu Mokoe Hulikohola Kahanamoku (August 24, 1890 – January 22, 1968) was a Native Hawaiian competition swimmer who popularized the ancient Hawaiian sport of surfing. He was born towards the end of the Kingdom of Hawaii, just before the overthrow, living into statehood as a United States citizen. He was a five-time Olympic medalist in swimming. Duke was also a law enforcement officer, an actor, a beach volleyball player and businessman.
According to Kahanamoku, he was born in Honolulu at Haleʻākala, the home of Bernice Pauahi Bishop which was later converted into the Arlington Hotel. He had five brothers and three sisters, including Samuel Kahanamoku. In 1893, the family moved to Kālia, Waikiki (near the present site of the Hilton Hawaiian Village), to be closer to his mother's parents and family. Duke grew up with his siblings and 31 Paoa cousins. Duke attended the Waikiki Grammar School, Kaahumanu School, and the Kamehameha Schools, although he never graduated because he had to quit to help support the family.