Altamuskin or Altamooskan (Irish: Allt a' Mhúscáin, meaning "Glen of the spongy ground") is a small village and townland in County Tyrone, Northern Ireland. It is situated in the historic barony of Clogher and the civil parish of Errigal Keerogue and covers an area of 1165 acres. In the 2014 Census Altamuskin had a population of 127 people (54 houses). It lies within the Omagh District Council area. The home of St Bridgets Altamuskin.