Jonathan Singer (born September 13, 1979) is a former legislator in the U.S. state of Colorado.

Singer graduated from Colorado State University with a degree in Psychology and Social Work, and in 2002 earned a Master's degree in Social Work also from CSU.

He worked for the Denver Office of Economic Development, and following that as a social worker in child protections for Boulder County.

[4] His political activities prior to joining the Colorado General Assembly include serving as President of the Longmont Area Democrats.

In the 2012 General Election, Representative Singer faced Republican challenger Ellyn Hilliard.