Events from the year 1703 in Ireland.

• Monarch: Anne

• June 11 – Charles Hickman is consecrated as Church of Ireland Bishop of Derry.
• September 11 – a privateering expedition comprising the ships St George and Cinque Ports commanded by William Dampier leaves Kinsale for South America.
• Parliament of Ireland assembles, the first under Anne, Queen of Great Britain, and the first for five years.
• Popery Act (An Act to prevent the further Growth of Popery), enacted by the Parliament of Ireland, reintroduces gavelkind: when a Roman Catholic dies, his estate is to be divided equally among his sons (legitimate or otherwise) if they retain their Catholic faith.
• Treason Act (Ireland) 1703, enacted by the Parliament of Ireland, enforces the Protestant line of succession to the British throne.
• Sir Robert Doyne is appointed as Chief Justice of the Irish Common Pleas.
• The Parliament of Ireland investigates the possibility of improving navigation on the rivers Shannon and Barrow and constructing a Newry Canal.

• January 22 (in France) – Antoine Walsh, slave trader and Jacobite (d. 1763 in San Domingo)
• February 5 – Gilbert Tennent, Presbyterian pastor in Colonial America (d. 1764)
• March 1 – Philip Tisdall, lawyer and politician (d. 1777)
• September 29 – Philip Syng, silversmith (d. 1789 in the United States)
• Arthur Gore, 1st Earl of Arran, politician (d. 1773)
• John Ussher, politician (d. 1749)
• Approximate date
  • John Blakeney, politician (d. 1747)
  • Samuel Boyse, poet (d. 1749)
  • Henry Brooke, novelist and dramatist (d. 1783)
  • George Faulkner, publisher and bookseller (d. 1775)