Johnstoun (Scots Gaelic: Baile Iain) is a toun in Renfrewshire in the wast Middle Lawlands o Scotland. The toun is three miles wast o Paisley an twal miles wast o Glesga ceety centur. In 2001 it haed 15,687 indwallers.
The toun wis a planned community shapit in the hint-end o the 18t centurie by local Laird George Ludovic Houston, who held an estate in the toun, the remains o whilk is kent as Johnstoun Castle. Industrial growthe brung coal minin, threid-makin an cotton weavin tae Johnstoun, makin it bouk hantle.