This article needs additional citations for verification
. (November 2011)
Notable events which occurred during 1903 relating to the island of Ireland.
- 3 January – the Norwegian ship Remittant is towed into quarantine in Queenstown with the entire crew suffering from beriberi.
- 3 February – the proposed canonisation of Oliver Plunkett is discussed in Rome.
- 26 February – the ocean liner SS Columbus is launched by Harland and Wolff at Belfast.
- 27 February – a meeting at the Mansion House, Dublin, enthusiastically welcomes a movement to establish Saint Patrick's Day as a national holiday.
- 8 March – Charles Gavan Duffy is buried at Glasnevin Cemetery in Dublin. He is laid to rest near others who took part in the Young Irelander Rebellion of 1848.
- 17 March – in Waterford, Saint Patrick's Day is marked as a public holiday (to encourage temperance).
- 26 March – the Chief Secretary for Ireland, George Wyndham, introduces his Irish Land Bill in the House of Commons of the United Kingdom.
- 31 March – the Lord-Lieutenant announces that Edward VII and Queen Alexandra intend to visit Ireland within the coming year.
- 15 May – the Chief Secretary for Ireland, George Wyndham, asks for support for his Irish Land Bill.
- 23 May – extracts from the annual report of the British Army shows that there are 35,717 Irishmen in its service.
- 9 June – the University of Dublin announces that it is to award degrees to women following a vote. The first women will be admitted as full members of its sole constituent, Trinity College, Dublin, in 1904.
- 1 July – the Belfast and Northern Counties Railway becomes the Northern Counties Committee of the Midland Railway (of England).
- 19–27 July – first visit to Ireland as monarch of King Edward VII, landing at Buncrana.
- 14 August – the Wyndham Land (Purchase) Act is passed in the House of Commons of the United Kingdom, offering special incentives to landlords to sell their entire estates.
- 5 September – Irish painter Henry Jones Thaddeus is granted permission to paint the first portrait of Pope Pius X.
- 13 November – the 2nd Battalion of The Royal Dublin Fusiliers is welcomed home after nearly 20 years of foreign service.
- 22 December – the well-known Irish optician, Patrick Cahill, who had the sole privilege of supplying the late Pope Leo XIII with spectacles, is to supply the present pontiff, Pope Pius X.