Mario Jorge Colazo, "El Potro", (born 4 March 1954) is an Argentine Radical Civic Union (UCR) politician.

He attended primary school in Córdoba before moving to Río Grande, Tierra del Fuego for his secondary education.

From an early age, Colazo was involved in the UCR and held senior positions in the party at provincial and national levels.

Then in 2003 he was elected as governor of the province, defeating incumbent Peronist Carlos Manfredotti and taking office in January 2004 with Hugo Cóccaro as his vice-governor.

However, in March 2008, a Tierra del Fuego court requested that the Senate expel him in connection with the ongoing allegations relating to improper use of funds while Mayor of Río Grande.