Aimm:To determine the association between prior extracurricular publication and the intention of medical students in Latin America publishing theses in scientific journals. Methods: Cross-sectional study, where the main variable was the intent to publish a thesis, investigating an association with prior extracurricular publication and other co-variables of interest. Prevalence ratios (PR) were estimated using generalized linear multilevel models. Results:Of 11,587, 7.9% self-reported previous publications and 2,9% had interest in publishing their thesis. We found that having previously published, increased the intention to publish a thesis in scientific journals (PR: 6.72, 95% CI: 5.12-8.84, p<0.001). Also positively associated with publishing a thesis included; being Peruvian (PR: 1.80, IC95%: 1.08-2.98, p = 0.023), being female (PR: 1.24, IC95%: 1.00-1.54, p = 0.046), being a fifth year student (PR: 2.26, 95% CI: 1.55-3.29, p<0.001), having an intermediate proficiency of the English language (PR: 1.62, 95% CI: 1.14-2.32, p = 0.008) and database training (PR: 1.58, 95% CI 1.14-2.18, p = 0.005). Conclusion:The intention of publishing theses in scientific journals is very low,however, having prior extracurricular publications increases the level of interest. These findings provide medical schools with information that will enable them to help reinforce the student's enthusiasm to publish and, thereby, greatly increase their decision to complete and publish a thesis.