Rúscaigh (Irish for 'marsh') may refer to several places on the island of Ireland:
A townland in the parish of Aghadowey, County Londonderry; see List of townlands in County Londonderry A townland in the parish of Drumachose, County Londonderry; see List of townlands in County Londonderry Rousky, a village in County Tyrone, Northern Ireland Roosky, a village in counties Leitrim and Roscommon, Ireland