Bankkajen

[Image:Riksdagen June 2011.jpg|thumb|250px|Western part of Helgeandsholmen with Bankkajen passing around the Parliament Building.]
[Image:Riksdagshus grund 1898.jpg|thumb|Construction of the quay in 1898.]
Bankkajen is a quay and a street passing along the western shore of the islet Helgeandsholmen in Gamla stan, the old town in central Stockholm, Sweden.
The name was adopted in 1925, after other proposals such as Banknäset and Bankstranden had been investigated. The quay was reinforced in 2002.