Several studies have observed a bilingual advantage in non-linguistic cognitive tasks. Even as the replicability of these findings is debated, there is much evidence to suggest that the bilinguals’ constant exertion to manage information from two active linguistic systems enhances the basic inhibitory control functions in bilinguals compared to monolinguals. The study extends this inquiry with trilinguals and tests the hypothesis that a trilingual advantage in inhibitory control would be observed in more cognitively demanding control tasks—tasks that involve both response inhibition and interference suppression. A sample of Filipino-English bilinguals and a sample of Chabacano-Filipino-English trilinguals in the Philippines were assessed for their bilingual and trilingual language proficiencies and later asked to complete a series of Simon arrow tasks. The results show that trilinguals were more accurate and efficient than bilinguals in the trials that involve interference suppression and response inhibition, but this advantage was negligible in trials involving only response inhibition.