Glinsk (Irish: Glinsce, meaning 'glen of the brambles') is a townland in the County Mayo Gaeltacht in Ireland. It is in the parish of Kilcommon and barony of Erris. Glinsk Mountain (304 metres) is a remote area of upland blanket bog with sea cliffs descending to Broadhaven Bay and continuing along the coast to a height of 255 metres at . The mountain is the source of the Muingnabo River.