Jonathan Daniel Álvez Sagar (born 31 May 1988) is a Uruguayan footballer who plays as a forward for Ecuadorian Segunda Categoría club Naranja Mekánica.

In 2008, he moved to Segunda División side Boston River, scoring his first senior goal on 29 November of that year in a 1–0 home win against Rocha.

[1] In September 2009, Álvez joined Coraceros Polo Club in the Segunda División Amateur, and scored 13 goals for the side; highlights included a hat-trick in a 3–1 away win against Albion.

[10] On 16 August 2014, Álvez moved abroad for the first time in his career, signing a one-year loan deal with Primeira Liga side Vitória Guimarães.

Álvez scored his first goal abroad on 19 September 2014, netting the equalizer in a 1–1 home draw against Paços de Ferreira.