John Lieswyn (born 18 August 1968) is an American former professional road bicycle racer.

After graduation from college in 1990, he raced three seasons for the US National team in Germany, France and Italy.

He returned to Europe in 1995, scoring numerous top ten results and winning the Delémont (Switzerland) mountain stage of the Regio-Tour.

In 2012 David Zabriskie the original winner of the 2004 United States National Time Trial Championships was found guilty of doping and his results from May 2003 to July 2006 were stripped.

[2] He retired from racing at the end of the 2005 season and moved to New Zealand to work as a transportation planner.