Ringsend (Irish: An Rinn) is a southside inner suburb of Dublin, Ireland. It is located on the south bank of the River Liffey and east of the River Dodder, about two kilometres east of the city centre. It is the southern terminus of the East Link Toll Bridge. Areas included in Ringsend are the south side of the Dublin Docklands, and at the west end is the area of South Lotts and part of the Grand Canal Dock area. Neighbouring areas include Irishtown, Sandymount and the Beggars Bush part of Ballsbridge to the south, and the city centre to the west. A key feature of the area is the chimneys of Poolbeg power station.

Formerly the point where ships arriving from across the Irish Sea would dock, Ringsend went into decline in the 19th and 20th centuries, when the shipping moved to other locations, although there is still some container shipping.

Ringsend was originally a long narrow peninsula separated from the rest of Dublin by the then much broader estuary of the River Dodder. On early maps, its name is given as 'Rin-Aun' meaning the point of the tide. Subsequently it was called "Ring's Ende" and the nearest settlements to it are given the names Merryon (Merrion) and Donny Brook. In addition to it being a centre for transportation from England, Wales and elsewhere, it was well known from early times for having a saltworks there.

Ringsend has long been known colloquially as Raytown, reflecting its history as a fishing village and popularity of the stingray fish, which is sold in local takeaways as battered ray.

Ringsend was originally part of the parish of St Mary's, Donnybrook.

At about the same time as the River Dodder was diverted at what is now the junction of Newbridge Avenue and Lansdowne Bridge, Sandymount (formerly known as The Brickfields) came into being. The English having moved the Irish outside the city walls started referring to the area towards the Ringsend peninsula as an "Irishtown." Reclamation of Dodder estuary and Liffey areas, including the building of York and Pidgeon House Roads and the Great South Wall (South Bull Wall), and development in the 16th and 17th centuries, out to the Poolbeg Lighthouse, led to an expansion of the area.

Ringsend has traditionally been identified as a place of shipbuilders and boat builders in the 19th century who owned yards with slipways leading into the Dodder. Among the shipyards was Greg Foley's which was located next door to Ringsend Catholic Church.

Oliver Cromwell arrived in Ringsend on August 15, 1649, with 4,000 horses and 8,000 foot-soldiers, and was received with acclamation by the people of Dublin.