Jacob Riley (born November 2, 1988) is an American long-distance runner.

[1] He placed second behind Galen Rupp at the 2020 United States Olympic Trials (marathon), securing a spot at the 2020 Tokyo Olympics (which were rescheduled to start July 2021 due to the COVID-19 pandemic).

[3] Riley was the first American (and ninth overall finisher) in the 2019 Chicago marathon, in a time of 2:10:36.

[4] Riley represents the Boulder Track Club where he is coached by Lee Troop.

[6] Riley won the 2012 USATF Club Cross Country Championship, covering the 10k race in a time of 29:58.