The 2018 Vuelta a San Juan was a road cycling stage race that took place in the San Juan Province of Argentina between 21 and 28 January 2018.

The race was rated as a 2.1 event as part of the 2018 UCI America Tour, and was the 36th edition of the Vuelta a San Juan.

[2] Initially, the race was won by Gonzalo Najar, who was later disqualified for a failed doping test.

The result was then given to the rider originally in second place, Óscar Sevilla.

[3] Twenty-seven teams started the race.