Evan Reese Jager (born March 8, 1989) is an American middle- and long-distance runner who specializes in the 3000 metres steeplechase.

Jager attended Harry D. Jacobs High School in Algonquin, Illinois, a suburb northwest of Chicago.

[4] In the summer after his freshman year, Jager qualified to represent the United States in the 2008 IAAF World Junior Track and Field Championships by winning the 1500 m in 3:47.43[5] at 2008 USA Junior Outdoor Track & Field Championships June 20–22, 2008 in Jesse Owens Memorial Stadium at Ohio State University in Columbus, Ohio.

He left the University of Wisconsin and moved to Portland to continue training with Schumacher, who had been hired by Nike to be a full-time coach to professional Nike-sponsored runners.

[6] Jager competed at his first USA Outdoor Track and Field Championships in the 5000 m, where he took the lead with 200 m to go before placing third behind his teammates Matt Tegenkamp and Chris Solinsky.

After taking some time off, he returned to competition, but the pain persisted and culminated in a stress fracture that he received in the 1500 m final at the USATF Championships on June 25.

He won that race in 8:26.14, a stunning time for a neophyte and close to the 8:23.1 Olympic A standard necessary for participation in the London Games.

Jager kicked off the 2013 indoor season at the Millrose Games two-mile, where he finished fourth in 8:14.95 to winner Bernard Lagat, who set the American record in that race.

Later on in the season he finished 2nd in the indoor mile at the Seattle Husky Classic in 3:56.14, where he got nipped at the line by his teammate, Andrew Bumbalough.

He followed up these personal record performances with an easy win at the USATF Outdoor Championships 3000 m steeplechase, where he finished in 8:20.67, giving him the opportunity to represent the USA at the IAAF World Championships in Moscow for the second time, and also winning him his second consecutive 3000 m steeplechase national title.

To kick off the 2014 outdoor season at the Prefontaine Classic, Jager ran a personal best of 3:53.33 to place him 3rd in the Men's International Mile.

On June 27, Jager won the steeplechase at the 2015 USA Outdoor Track and Field Championships in 95 degree temperature in Eugene, Oregon.

On July 4, Evan lowered the American Record in the steeplechase to 8:00.45 in 2015 Paris Meeting Areva Diamond League, despite falling over the final barrier.

[15] The race started out slow for the first kilometer in 2:51.81, then soon after Jager took the lead and held on to it, until 300 m remaining where he was passed, first by Conseslus Kipruto (1st) and then Soufiane El Bakkali (2nd).