Events from the year 1638 in Ireland.
Incumbent Monarch: Charles I
Events 13 January – proclamation enforcing the monopoly on tobacco held by the Lord Deputy of Ireland, Sir Thomas Wentworth.
Arts and literature 1 January – James Shirley's comedy The Royal Master is premiered at the Werburgh Street Theatre, Dublin.
Births Valentine Browne, 1st Viscount Kenmare, peer (d. 1694)
Deaths 14 June – Claud Hamilton, 2nd Baron Hamilton of Strabane (b. c.1606)
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