Given that the use and comprehension of figurative language is one of the most intriguing abilities of the mind, this study extends the line of research related to the process of understanding figurative language to individual differences. The starting assumption is that individual differences affect our ability to understand figurative language, focusing on fluid and crystallized intelligence. These types of intelligence were measured in relation to the ability t1o understand metaphors, and their influence was investigated indirectly, through tests that reliably examine both types of intelligence. The research investigates non-literary metaphors in the Serbian language, normed according to the following dimensions: metaphoricity, aptness, and familiarity. This study seeks to show whether and to what extent fluid and/or crystallized intelligence influence the process of understanding non-literary metaphors normed according to different features. Through selected verbal and non-verbal tests, Raven’s progressive matrices (Raven, 1938), semantic similarities test (Stamenković, Ichien, & Holyoak, 2019a), as well as a non-literary metaphor comprehension test, it is determined in which way fluid and crystallized intelligence play roles in the process of metaphor comprehension, as well as which possible cognitive mechanism allows us to process metaphors. The results show that the comprehension of non-literary metaphors mostly relies on crystallized intelligence, while fluid intelligence seems to be employed in individual cases, only with some groups of metaphors.