In French, the word cinéma is masculine. You would use the masculine article le to refer to it, so you would say le cinéma.
Gender in French nouns can be a bit tricky for learners. It doesn’t always follow a pattern you might expect, and there are no hard-and-fast rules for determining the gender of a noun. Many words that refer to professions or roles can change gender depending on the context or the person. However, in this case, cinéma is consistently treated as a masculine noun.