Coosan (Irish: Cuasán, meaning 'cavern" or "grotto')[1] is a townland and suburb just north of Athlone, County Westmeath in Ireland.

Coosan attracts tourists over the summer months due to its location on the edge of Lough Ree.

[3] The Lough Ree Yacht Club is located in the area.

[4] Coosan is divided into three 'quarters': Castlequarter, Hillquarter and Meehanquarter.

This article related to the geography of County Westmeath, Ireland is a stub.