Leonard Essau Korir (born December 10, 1986) is an American long-distance runner who competes over distances from 5000 meters to the marathon.

He opted to study political science at Iona College, an institution he recognised as a fellow Kenyan, Richard Kiplagat, had attended there.

He regularly ran in lower-level American road races, with highlights including third at the 2014 Boston Half Marathon.

[8] In 2015, a win at the New York Half Marathon in 61:06 minutes established him among the best on the American circuit, as he edged training partner Stephen Sambu by one second.

[10] In his debut at the national level, he placed in the top three at the 2016 United States Olympic Trials behind Galen Rupp and Shadrack Kipchirchir (another former Kenyan).