Lindsay Flanagan (born January 24, 1991) is an American long-distance runner.

At 2008 Nike Outdoor Nationals as a junior at Lake Park High School, placed 10th in 2 miles in 10:36.73.

As a senior at Lake Park High School, Lindsay Flanagan was 2008 Illinois High School Association 3A cross country state champion.

Lindsay Flanagan was honored as 2008 Gatorade Cross Country Athlete of the Year for Illinois after placing 9th at 2008 Foot Locker Cross Country Championships in San Diego, California and 5th at 2008 Nike Team Nationals cross country in Portland, Oregon.

Flanagan placed 4th in 2 mile at 2009 Nike Indoor Nationals in Reggie Lewis Track and Athletic Center in 10:27.79.

In college, she ran for the Washington Huskies where she was 9th at 2010 USA Junior Cross Country Championships and 2009 NCAA third place cross country team. She represented USA at 2010 NACAC Junior XC Championships in Tobago where she placed sixth overall and third among Americans as Team USA placed second. Flanagan earned Division I All-American honors at 2014 NCAA Division I Outdoor Track and Field Championships in 10,000 meters (14th in 33:32.33).

Flanagan won 2013 Chicago Half Marathon in 1:16:36 and placed 4th at the 2013 Big Sur Half Marathon in 1:13:56.

Flanagan placed 5th at 2014 Pittsburgh 10 Miler in 55:00 and placed 15th at 2014 Philadelphia Rock 'n' Roll Half Marathon in 1:15:22.