An Act for the division of Meath into two shires (referred to in the modern Irish Statute Book as the Counties of Meath and Westmeath Act 1543) was an Act of the Parliament of Ireland passed in 1542 which resulted in the division of County Meath, shired in 1297, into the counties of Meath and Westmeath. The Act commenced on Saint Catherine's Day in 1542 and remains in effect.