|Sergio Fajardo Valderrama|
|Governor of Antioquia|
January 1, 2012 – January 1, 2016
|Preceded by||Luis Alfredo Ramos|
|Succeeded by||Luis Perez|
|Mayor of Medellín|
January 1, 2004 – January 1, 2007
|Preceded by||Luis Pérez Gutiérrez|
|Succeeded by||Alonso Salazar Jaramillo|
June 19, 1956 |
|Political party||Compromiso Ciuadadano|
|Green Alliance (2010-2015)|
|Spouse(s)||Ana Lucrecia Ramírez R.|
|Alma mater||University of the Andes
University of Wisconsin–Madison
Sergio Fajardo Valderrama, (Born June 6, 1956) is a Colombian Politician and Mathematician. Fajardo served as the Governor of Antioquia from 2012-2016.  He first entered politics in 2003 when he was elected Mayor of Medellin, the second-largest city in Colombia and the capital of Antioquia.  Fajardo was the Vice Presidential nominee of Antanas Mockus in 2010, finishing in second place after losing the runoff against Juan Manuel Santos and Angelino Garzon. Fajardo brands himself as a pragmatic politician with no particular ideology, with political analysts and media outlets in Colombia labelling him as a centrist politician not tied to the traditional parties in Colombia.
In July 2017, Sergio Fajardo announced his campaign to run for President in the upcoming elections in 2018. 
Fajardo is married to Ana Lucrecia Restrepo, and is the father to Mariana Fajardo and Alejandro Fajardo. He graduated (high school) from the Colegio Benedictino, and has an undergraduate and a graduate degree (M.Sc) in mathematics from the Universidad de los Andes - Bogotá. Fajardo then went to the United States to study, and earned a PhD in Mathematics with a minor in economics from the University of Wisconsin-Madison.
As a journalist he was subdirector of El Colombiano and wrote a regular column for El Mundo, El Espectador and Dinero; he had roles in the TV programs Operación Ciudad in Telemedellín and Zanahoria in Teleantioquia and also formed part of the Viva FM Caracol Radio team.
He has been involved in peace processes as founding member of the Comisión Facilitadora de Paz de Antioquia while Álvaro Uribe was the governor of Antioquia and has given conferences on Colombia's armed conflict. He is also a member of Washington D.C. based think tank the Inter-American Dialogue.
In 2009, Fajardo, along with Alejandro Echeverri, were awarded the winners of the Curry Stone Design Prize, for their bold and ambitious public works plan for the city of Medellín.
- Fajardo, S., Keisler, H.J. (2002), Model Theory of Stochastic Processes. Lecture Notes in Logic. Association for Symbolic Logic. A.K.Peters, Natick, MA. ISBN 1-56881-172-1.
- Fajardo, S. (2007), Medellín del miedo a la esperanza. Alcaldía de Medellín.
- Administrator (December 31, 2011). "SERGIO FAJARDO V". Gobernacion de Antioquia. Retrieved 2012-05-31.(Spanish)
- Romero, Simon (2006-07-15). "'Medellín's Nonconformist Mayor Turns Blight to Beauty'". The New York Times. Retrieved 2007-07-16.
- "Inter-American Dialogue | Experts". www.thedialogue.org. Retrieved 2017-04-11.