The New Castle, County Down

Newcastle (Irish: An Caisleán Nua) is a small seaside resort town in County Down, Northern Ireland, which had a population of 8,298 at the 2021 Census. It lies by the Irish Sea at the foot of Slieve Donard, the highest of the Mourne Mountains. Newcastle is known for its sandy beach, forests (Donard Forest and Tollymore Forest Park), and mountains. The town lies within the Newry, Mourne and Down District. The town aims to promote itself as the "activity resort" for Northern Ireland. It has benefited from a multi-million pound upgrade to the promenade and main street. The town is twinned with New Ross, County Wexford, in the Republic of Ireland.

Newcastle railway station was on the Belfast and County Down Railway which ran from Belfast to Newcastle, County Down in Northern Ireland.

The Rock Pool is an open air, sea pool located in Newcastle, County Down, Northern Ireland. It was opened in 1933 and is the last of its kind still in operation in Ireland. The pool is owned and operated by Newry, Mourne and Down District Council (Down District Council prior to the local government reform which came into effect on 1 April 2015).

Bryansford GAC (Irish: Áth Bhriain) is a Gaelic football and ladies' Gaelic football club in Newcastle, County Down, Northern Ireland. Founded in 1926, their most notable period was in 1970, when they won the Ulster Senior Club Football Championship.

The 2002 Senior British Open, for sponsor reasons named Senior British Open presented by MasterCard, was a professional golf tournament for players aged 50 and above and the 16th British Senior Open Championship, held from 25 to 28 July at Royal County Down Golf Club in Newcastle, County Down, Northern Ireland, United Kingdom. In 2018, the tournament was, as all Senior British Open Championships played 1987–2002, retroactively recognized as a senior major golf championship and a PGA Tour Champions (at the time named the Senior PGA Tour) event.Noboru Sugai won by two strokes over John Irwin to win his first Senior British Open title and first senior major championship victory. Sugau became the first winner of the Senior British Open to lead after every round since Gary Player in 1988.

The Irish Open (Irish: Comórtas Oscailte na hÉireann), currently titled as the Amgen Irish Open for sponsorship reasons, is a professional golf tournament on the European Tour. The Irish Open was first played in 1927 and was played annually, except for the war years, until 1950. There was a tournament in 1953, but the event was then not played again until revived in 1975. It has been contested annually since then. From 1963 to 1974 Carroll's sponsored a tournament, generally called the Carroll's International and in 1975 they became the sponsor of the Irish Open which became known as the Carroll's Irish Open. The Irish Open was one of the European Tour Rolex Series events form 2017–2020. The Rolex Series started in 2017, with each tournament in the series having a minimum prize fund of $7 million. During this period,the date was moved to early July, two weeks before The Open Championship. It is currently held in early September. From 2014 to 2022 (except in 2016), it was one of the Open Qualifying Series with the leading three players who have not already qualified and who finish in the top ten, qualifying for The Open Championship.

The 2000 Senior British Open, for sponsor reasons named Senior British Open presented by MasterCard, was a professional golf tournament for players aged 50 and above and the 14th British Senior Open Championship, held from 27 to 30 July at Royal County Down Golf Club in Newcastle, County Down, Northern Ireland, United Kingdom. In 2018, the tournament was, as all Senior British Open Championships played 1987–2002, retroactively recognized as a senior major golf championship and a PGA Tour Champions (at the time named the Senior PGA Tour) event.Christy O'Connor Jnr beat John Bland by two strokes and successfully defended his Senior British Open title from 1999. Bland repeated his second place finish from the year before.

Royal County Down Golf Club is a golf club in Northern Ireland, located in Newcastle, County Down. It opened on 23 March 1889 and is one of the oldest golf clubs in Ireland. It has two 18-hole links courses, the Championship Course and the Annesley Links.

The 41st Walker Cup Match was played on 8 and 9 September 2007 at the Royal County Down Golf Club in Newcastle, County Down, Northern Ireland. Team United States won 12½ to 11½. The United States won by the same score in 2005.

Shimna Integrated College is an integrated secondary school based in Newcastle, County Down, Northern Ireland. The all-ability school was founded in 1994 with the hope of integrating young people from both sides of Northern Ireland's religious divide and giving all of its students 'self-esteem'.

The Shimna River (Irish: Simhné, meaning river of bulrushes) is a river in County Down, Northern Ireland. It rises on the slopes of Ott Mountain, in the Mourne Mountains, and enters the Irish Sea at Newcastle, on Dundrum Bay. It is acidic and nutrient-poor, as a result of which its most common flora are mosses and liverworts, including the rare Portuguese feather-moss and Holt's mouse-tail moss. Its principal fish are salmon and sea trout, and it is managed by the Shimna Angling Club. The river is an Area of Special Scientific Interest (ASSI). The Shimna has a history of flooding; the most serious recent flooding was in 2008. There have also been incidents of pollution, and there were serious fish kills in 2004, 2006 and 2009.

Newcastle Lifeboat Station is situated at South Promenade, Newcastle, a seaside town in County Down, located the foot of Slieve Donard, the highest of the Mourne Mountains, overlooking the Irish Sea, in the south east corner of Northern Ireland. A lifeboat was first stationed at Newcastle in 1854 by the Royal National Lifeboat Institution (RNLI). The station currently operates the All-weather Mersey-class lifeboat, 12-20 Leonard Kent (ON 1177), on station since 2022, and the smaller D-class (IB1) Inshore lifeboat Eliza (D-775), on station since 2014.