<p>Intermarriage between immigrants and the native-born has been considered crucial in the process of migrant social integration. These unions may enhance ethnic and cultural diversity in host countries while influencing social integration. Whereas intermarriage has been widely studied in other contexts, it has been scarcely studied in Mexico. This paper analyses different-sex unions of Latin American immigrants in Mexico. Drawing on 2015 Mexican Intercensal Survey and 2020 Mexican Census data, I estimate multinomial logistic regression models to determine the probability of being in a union with an immigrant from the same nationality, a Mexican (native), or a spouse from another Latin-American country. Results show that recent immigrants from the Caribbean and South America have a higher probability of being in unions with people from the same nationality compared with Central Americans. However, birthplace interacts with ethno-racial identity and time since arrival in Mexico. This paper is the first to explore this for the Mexican case and aims to spur research in non-traditional immigration countries.</p>