Anton Krupicka (born 2 August 1983) is an American ultra-runner.

Krupicka is known for his long hair and beard as well as his minimalist approach to life.

Krupicka is featured in the film Indulgence: 1000 Miles Under The Colorado Sky[8] which chronicles his Summer 2007 training leading up to the Leadville Trail 100.

[9] He used to be a graduate student at the University of Colorado, but dropped out to be a professional runner.

Krupicka earned his BA from Colorado College[10] in 2005, double-majoring in physics and philosophy.