Nathaniel William "Nat" Niles was an American tennis player and figure skater who competed in single skating, pair skating, and ice dancing between 1914 and 1932. He was born in Boston, Massachusetts and died in Brookline, Massachusetts.

The U.S. Figure Skating Championships is a figure skating competition held annually to crown the national champions of the United States. The competition is sanctioned by U.S. Figure Skating. In the U.S. skating community, the event is often referred to informally as "Nationals". Medals are currently awarded in four disciplines: men's (boys') singles, ladies' (girls') singles, pair skating, and ice dancing in four colors: gold (first), silver (second), bronze (third), and pewter (fourth) on two levels, senior and junior. Medals were previously given at the novice, intermediate, and juvenile levels. The event is also used to determine the U.S. teams for the World Championships, World Junior Championships, Four Continents Championships, and Winter Olympics, however, U.S. Figure Skating reserves the right to consider other results.