Daniel Carlos Martínez Villamil (born 23 February 1957) is a Uruguayan industrial engineer and politician, who served as intendant of Montevideo from 2015 to 2019.

He previously served as Senator of the Republic from 2010 to 2015, as minister of Industry, Energy and Mining in the administration of José Mujica from 2008 to 2009 and as president of the state-owned petrol company ANCAP from 2005 to 2008.

A member of the Socialist Party – Broad Front, he was a candidate for president in the 2019 general election, being defeated in the second round by Luis Lacalle Pou.

From March 3, 2008 until August 31, 2009, he served as Uruguayan Minister of Industry, Energy and Mining in the government of President Tabaré Vázquez.

[7] After a very close runoff election against National Party candidate Luis Lacalle Pou, Martinez was defeated by just over 37,000 votes, and withdrew after absentee ballots were counted.