Paraguayan nationality law is based on the principle of Jus soli.

The nationality law is based on the Chapter 3 of the Paraguayan Constitution of 1992.

[1][2][3] Any person born in Paraguay acquires Paraguayan nationality at birth.

[4] As of 2022, the only countries that have a reciprocity agreement in regards to dual nationality with Paraguay are Spain[5] and Italy.

In the latter category, naturalizing in another country or being expatriated from the country for more than three years without permission, results in loss of nationality, as provided in Article 150 of the National Constitution of Paraguay,[6] and proceedings thereunder must be instituted by an individual or an agency, for instance, the Migration department.