Is a gorilla more closely related to a gibbon or an orangutan?

A gorilla is more closely related to an orangutan than to a gibbon. Both gorillas and orangutans belong to the family Hominidae, which includes great apes, while gibbons are part of the family Hylobatidae, which are lesser apes. The evolutionary split between the lineage leading to gorillas and orangutans occurred more recently than the split between gibbons and the great apes. Therefore, genetically and evolutionarily, gorillas share a closer ancestry with orangutans.