This article is about the particular significance of the year 1911 to Wales and its people.
- February–April - A Welsh Nationalist League is founded, based in Caernarfonshire, to campaign for Home Rule.
- 23 June - The future Edward VIII of the United Kingdom is created Prince of Wales by his father, King George V.
- July - Dockers' strike action at Cardiff culminates in rioting. Five hundred troops are drafted into the area.
- 13 July - The new Prince of Wales is invested with his title in a ceremony at Caernarfon Castle, devised by David Lloyd George.
- 23 July - King George V and Queen Mary lay the foundation stone of the new National Library of Wales in Aberystwyth.
- August - Rioting in Bargoed, Brynamman, Ebbw Vale and Tredegar. Jewish-owned businesses are attacked and troops brought in.
- 19 August - Lanelli riots: During demonstrations in support of a national railway strike (17–20 August), two men are shot dead by soldiers of the Worcestershire Regiment in Llanelli. Magistrates' homes are attacked and four more of the crowd are killed outright when explosive material stored on railway property ignites.
- 4 September - Members of the South Wales Miners' Federation return to work after a ten-month strike against colliery owners in the Cambrian Combine which triggered the Tonypandy Riots, having accepted the 2s 3d per ton payment rate negotiated prior to the strike by William Abraham.
- September–October - Rioting during industrial unrest in Swansea.
- 16 December - The Imperial Copyright Act (coming into effect in 1912) entitles the National Library of Wales to be given by legal deposit a copy of all British publications in specified categories, based on a memorandum drafted by Daniel Lleufer Thomas.
- University College of North Wales, Bangor, moves to new buildings.
Arts and literature 
New books 
- 27 March - Alwyn D. Rees, writer (died 1974)
- 26 May - Gwilym Tilsley, poet and archdruid (died 1997)
- 30 June - Alfred Janes, artist (died 1999)
- 23 July - Idris Foster, academic (died 1984)
- 29 August - Raymond Bark-Jones, Wales international rugby player
- 2 September - Jack Petersen, boxer (died 1990)
- 4 September - John Robert Jones, philosopher
- 12 October - Iorrie Isaacs, Wales international rugby player (died 1966)
- 12 November - Pennar Davies, clergyman and author (died 1996)
- 20 November - Bernard Cowey, Wales international rugby union player (died 1997)
- 7 December - John Gwyn Griffiths, academic (died 2004)
- date unknown
- 8 February - Frederick Campbell, 3rd Earl Cawdor, politician, 63
- 3 March - Jacob Thomas, Victoria Cross recipient (born 1833)
- 29 April - Hugh Robert Hughes, genealogist, 83
- 12 July - Harry Day, Wales international rugby player, 47
- 13 August - Thomas Thomas, boxer, 31
- 18 August - Henry James, 1st Baron James of Hereford, politician, 82
- 28 August - Jack Williams, Wales international rugby player, 28
- 12 September - Arthur John Williams, politician, 77
- 11 November - Robert Davies Roberts, scientist and author, 60
- 11 December - Rowland Ellis, bishop, 70