Shrule Castle (Irish: Caisleán Sruthair, meaning 'Castle of the River') is a ruined tower house near Shrule in County Mayo, Ireland.

The castle was captured in 1570 by a strong force led by Sir Edward Fitton, President of Connaught and Vice Treasurer of Ireland, the force mainly consisted of the McDonnells of Knocknacloy's gallowglass warriors.

Mac William Uachtar, Lord of Thomond, the de Burghs of Mayo and McDonnells of Mayo led a force to retake the castle, however they did not succeed.

In 1610, Richard Burke, 4th Earl of Clanricarde leased the castle and lands to Pierce Lynch of Galway.

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