Katelyn Tuohy is an American long distance runner from Rockland County, New York. Encouraged by her parents, Patrick and Denise, she won the 2017 Nike National cross country championship as a sophomore, to cap an undefeated season. With a time of 16:44.7, she won by 40 seconds, trimming 12 seconds off the course record. The Rockland County legislature honored her victory, declaring December 19, 2017, as "Katelyn Tuohy Day." Tuohy competes for the North Rockland High School Red Raiders.