Genex Tower (Serbian: Kula Geneks), or Western City Gate 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.
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.