Legacy
Commemorative stamps showing him were issued in 1957 and 2003 by the Irish government, and in 1891, 1935, 1957, 1977, 1979, 1980, 1982, 1983, 1985, 2007, 2014, by the Argentine government.
Since the mid-1980s, a replica of Brown's sword has been worn by Admirals of the Argentine Navy. One such replica is on display in the National Maritime Museum of Ireland. The original is in the National Historical Museum of Argentina.
Statues and memorials of Brown's battles are located in both Buenos Aires and Foxford, his birthplace in Ireland. A museum to his honour was opened in Foxford, located on Lower Main Street. In April–June 2006 the Irish Naval Service patrol boat LÉ Eithne travelled to Buenos Aires in the first-ever deployment of an Irish warship in the southern hemisphere, in order to participate in commemorations of the impending sesquicentenary of Brown's death, and to bring back a statue of Brown to be displayed in Dublin. During the trip, LÉ Eithne made a stop in the city of Mar del Plata, where they visited Plazoleta Almirante Brown (Admiral Brown's Square) and pay tribute to the Irish naval hero along with their colleagues of the Argentine Navy.
Bertie Ahern, the Irish Taoiseach, said on 27 September 2006 on the occasion of unveiling the new statue of Brown on Admiral Brown Way, Sir John Rogerson's Quay, Dublin: "Back in 2001, it was my honour to lay a wreath at the Admiral Brown monument in Buenos Aires and to unveil a plaque commemorating my visit there. I brought away with me a clear sense of just what a significant figure William Brown is in Argentine history as well as a real idea of just how strong the links are, past and present, between our two countries."
Located in Casa Amarilla, a replica of Brown's house in La Boca neighbourhood, the Brownian National Institute (Instituto Nacional Browniano) was created in 1948 for "research and study the nation's maritime history and naval interests, and cooperate with both the Argentine and Irish governments in the investigation of William Brown's life and military achievements". The centre is based in Buenos Aires, with branches throughout the country.
Also, a substantial number of Argentine warships and political entities have been named after him. Examples include:
The Almirante Brown class of destroyers, a group of four German-designed military ships commissioned between 1983 and 1984 for the Argentine navy.
ARA Almirante Brown (C-1), an Italian-built cruiser in service during World War II, whose design was similar to those of the Trento class.
ARA Almirante Brown (D-10), a currently active destroyer.
The Almirante Brown Antarctic Base, an Antarctic base located in Paradise Bay.
In 1982 the Wolfe Tones composed and performed a tribute song titled "Admiral William Brown".
The Almirante Brown department in Chaco Province, in the country's northern region.
The Almirante Brown Partido in Buenos Aires Province, located at the south of the Gran Buenos Aires urban area.
The Admiral William Brown National College, a high school located in Adrogué, Buenos Aires Province. Spanish: Colegio Nacional Almirante Guillermo Brown.
Four different football clubs: Club Atlético Almirante Brown located in the town of Arrecifes, Club Almirante Brown located in Isidro Casanova, Brown Athletic Club from Adrogué, and Puerto Madryn-based Guillermo Brown.
Since 25 November 2012, the winner of the rugby international between Argentina and Ireland has been awarded The Admiral Brown Cup (La Copa Almirante Brown). Ireland became the first team to win this after defeating Argentina 46 points to 24 points.