Bernard Kipchirchir Lagat (born December 12, 1974) is a Kenyan-American middle and long-distance runner. Lagat was born in Kapsabet, Kenya. Prior to his change of domicile to the US, Lagat had an extensive competitive career representing his native country. He is the American record holder in the 1500 m and mile run indoors, as well as the 1500 m and 3000 m outdoors, and is the Kenyan record holder at 1500 m outdoors. Lagat is the second fastest 1500 m runner of all time, behind Hicham El Guerrouj.