← 1402 1401 1400 1399 1398 1403 in Ireland → 1404 1405 1406 1407 1408
Centuries:	13th 14th 15th 16th 17th
Decades:	1380s 1390s 1400s 1410s 1420s
See also:	Other events of 1403 List of years in Ireland

Events from the year 1403 in Ireland.

• Lord: Henry IV

• Tadhg Ruadh Ó Cellaigh succeeded Conchobar an Abaidh Ó Cellaigh as King of Hy-Many in present-day counties Galway and Roscommon.
• Maolmhordha mac Con Connacht succeeds Giolla Iosa mac Pilib, as King of East Breifne, in present-day counties Leitrim and Cavan.
• The Garter, an ornament attached to the Great Sword of State of Dublin, was presented to the citizens of Dublin in 1403 by King Henry IV.
• Laurence Merbury took the role as deputy to Lord Chancellor Thomas Cranley when the latter could not work due to old age.
• Thomas Bache was appointed as the Chief Baron of the Irish Exchequer, and granted letters of protection by Henry IV.^[1]
• Robert Sutton was appointed as the Deputy Treasurer of Ireland.
• Stephen de Bray, then Lord Chief Justice of Ireland, was granted the power to issue writs of novel disseisin.
• Mac Raith Ó hEidirsgeóil was replaced by Stepehn Brown as the new Bishop of Ross.

• Nicholas Ó hÍceadha and Boulger O'Callahan wrote a commentary on the Aphorisms of Hippocrates.^[2]

• Conchobar an Abaidh Ó Cellaigh, king of Hy-Many (birth date unknown)^[3]