Nathaniel William "Nat" Niles (July 5, 1886 – July 11, 1932) was an American tennis player and figure skater who competed in single skating, pair skating, and ice dancing between 1914 and 1932.

Blanchard and Niles also won a five national titles in ice dancing.

While a student at Harvard, he was an NCAA champion for the sport.

[4] With Edith Rotch, he won the 1908 mixed doubles title, and in 1917, he reached the singles final, losing to Robert Lindley Murray in four sets.

His last figure skating competition, with Blanchard, had been the pairs event at the 1932 World Figure Skating Championships earlier the same year.