Daniel Carlos Martínez Villamil (born 1957) is a Uruguayan political figure.
Daniel Martínez pursued a mechanical engineering career prior to taking up a ministerial post. For many years he was Vice President of the Uruguayan Engineers' Association.
He was elected Mayor of Montevideo in 2015.
He is a member of the Uruguayan Socialist Party, having been active during the period of civilian-military rule 1973-1985.
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. He succeeded Jorge Lepra in that post.