thumb|Location of Ruoholahti quarter within Helsinki highlighted in red, rest of the [[Länsisatama district in light red.]]
thumb|200px|The Ruoholahti canal
thumb|200px|Ruoholahti district viewed from the north
thumb|200px|[[Kaapelitehdas (Cable Factory) culture centre]]
Ruoholahti (; ; both meaning "Grass Bay") is a quarter in Helsinki, part of the Länsisatama neighbourhood and Kampinmalmi district. It is located in the southwestern part of the central city area of Helsinki, close to the Lauttasaari island, and it functions as the principal connection between the Helsinki city centre and the city of Espoo to the west. Ruoholahti is inhabited by approx. 3300 people. The Länsisatama port is also situated in Ruoholahti.
History
The Ruoholahti area was created in the 1910s by connecting several small islands with earth fill. Its purpose was to accommodate the above-mentioned port. In the 1940s there also developed a small industrial district whose most notable buildings were the cable factory (Kaapelitehdas) of Nokia (which later became a cultural centre when Nokia gave up cable manufacturing and moved on to telecommunications),