Gelu may refer to:
People Gelou, 10th-century leader of the Vlachs and Slavs in Transylvania Gelu Barbu (1932–2016), Romanian-born Spanish ballet dancer and choreographer Gelu Lisac (born 1967), Romanian water polo player Gelu Radu (born 1957), Romanian weightlifter Gelu Velici (born 1992), Romanian footballer Gelu Vlașin (born 1966), Romanian poet Gelu Voican Voiculescu (born 1941), Romanian politician Jacques Gélu (), Archbishop of Embrun Lakpa Gelu (born 1967), Nepalese Sherpa climber
Places Iran Gelu, Qaleh Ganj, a village in Kerman Province Gelu, Rudbar-e Jonubi, a village in Kerman Province
Nepal Gelu, Nepal
Romania Gelu, Satu Mare Gelu, a village in Terebești Commune, Satu Mare County Gelu, a village in Variaș Commune, Timiș County
Other uses Karluks, a Turkic tribal confederacy Gelu, a fictional character introduced in Heroes of Might and Magic III: Armageddon's Blade GELU (Gaussian error linear unit), a type of activation function used in artificial neural networks