Matías Damián Alonso Vallejo (Spanish pronunciation: [maˈti.as aˈlonso]; born 16 April 1985) is a Uruguayan professional footballer who plays as a forward.

He moved to Spain subsequently, first with RC Celta de Vigo's reserves in the country's Segunda División B. Alonso joined Real Murcia CF in 2007, being immediately loaned to another team in the third division, SE Ibiza-Eivissa.

[4] In the following transfer window, without having made any official appearances for the Andalusians, he returned to his country, signing with C.A.

[5] On 1 September 2011, Alonso agreed to a one-year loan with Zamora CF in Spain's third tier.

[6] In February 2013, after a brief spell in China, he returned to his homeland and joined Juventud de Las Piedras.