Genex Tower (Serbian: Кула Генекс, Kula Geneks), or Western City Gate (Serbian: Западна Капија Београда, Zapadna Kapija Beograda), is a 35-storey skyscraper in Belgrade, Serbia, which was designed in 1977 by Mihajlo Mitrović in the brutalist style. It is formed by two towers connected with a two-storey bridge and revolving restaurant at the top. It is 115 metres tall (with restaurant 135–140 metres) and is the second-tallest high-rise in Belgrade after Ušće Tower. The building is designed to resemble a high-rise gate greeting people arriving in the city from the West (the road from Belgrade Nikola Tesla Airport to the city centre leads this way).
One of the towers is occupied by the Genex Group. The tower got its popular name "Genex" after this group, while its official title remains Western City Gate. The second, taller tower, is residential.
The building is located in the Novi Beograd municipality.