:Guillermo Brown de Puerto Madryn

The club was named in honour of Guillermo Brown who was the Irish-born first admiral of Argentina in the mid 19th Century.

Brown finished at the top of their group in the 2006 Clausura for the Torneo Argentino A, but failed in the next stage, after being defeated by San Martín de Tucumán in the playoff series with scores of 0–3 and 2–2.

On May 19, 2012, Brown achieved its greatest professional achievement in football, managing a 2–2 draw at Estadio Monumental with a last minute goal from {{Interlanguage link|Hernán Zanni|lt=Hernán Zanni|es|Hernán Zanni}} against a River Plate squad with notable players such as David Trezeguet, Fernando Cavenaghi, Lucas Ocampos, and Alejandro Dominguez.{{Cite web|date=May 19, 2021|title=A 9 años de la hazaña que dejó mudo al Monumental|url=https://www.diariojornada.com.ar/301305/deportes/a_9_anos_de_la_hazana_que_dejo_mudo_al_monumental/|access-date=|website=Diariojornada.com}}{{Cite web|date=May 19, 2012|title=River empató con Guillermo Brown, resignó puntos y ahora es escolta de Central|url=https://www.lacapital.com.ar/ovacion/river-empato-guillermo-brown-resigno-puntos-y-ahora-es-escolta-central-n364845.html|access-date=|website=La Capital|language=es}}

{{Updated|24 July 2022}}[https://nr.soccerway.com/teams/argentina/atletico-guillermo-brown/7054/squad/ Guillermo Brown squad], soccerway.com

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{{Fs player|no= |nat=ARG |pos=GK |name= Martín Perafán|other=loan from Quilmes}}

{{Fs player|no= |nat=ARG |pos=GK |name= Facundo Perrone}}

{{Fs player|no= |nat=ARG |pos=DF |name= Agustín Pereyra}}

{{Fs player|no= |nat=ARG |pos=DF |name= Agustín Sandona}}

{{Fs player|no= |nat=ARG |pos=DF |name= Facundo Rodríguez}}

{{Fs player|no= |nat=ARG |pos=DF |name= Nicolás Herranz}}

{{Fs player|no= |nat=ARG |pos=DF |name= José Villegas}}

{{Fs player|no= |nat=ARG |pos=DF |name= Federico Mancinelli}}

{{Fs player|no= |nat=ARG |pos=DF |name= Gastón Benedetti|other=loan from Estudiantes}}

{{Fs player|no= |nat=ARG |pos=DF |name= Juan Ignacio Rodríguez|other=loan from Banfield}}

{{Fs player|no= |nat=ARG |pos=DF |name= Rodrigo González|other=on loan from Rosario Central}}

{{Fs player|no= |nat=ARG |pos=MF |name= Cristian García}}

{{Fs player|no= |nat=ARG |pos=MF |name= Juan Silva}}

{{Fs mid}}

{{Fs player|no= |nat=ARG |pos=MF |name= Ezequiel González|other=loan from Belgrano}}

{{Fs player|no= |nat=ARG |pos=MF |name= Agustín Colazo|other=loan from Belgrano}}

{{Fs player|no= |nat=ARG |pos=MF |name= Renso Pérez}}

{{Fs player|no= |nat=ARG |pos=MF |name= Esteban Obregón|other=loan from Estudiantes}}

{{Fs player|no= |nat=ARG |pos=MF |name= Martín Rolle}}

{{Fs player|no= |nat=URU |pos=MF |name= Gabriel Navarro}}

{{Fs player|no= |nat=ARG |pos=FW |name= Mauro Fernández}}

{{Fs player|no= |nat=ARG |pos=FW |name= Franco Torres|other=loan from Gimnasia LP}}

{{Fs player|no= |nat=ARG |pos=FW |name= Sergio González}}

{{Fs player|no= |nat=ARG |pos=FW |name= Flavio Ciampichetti}}

{{Fs player|no= |nat=ARG |pos=FW |name= Gonzalo Urquijo}}

{{Fs player|no= |nat=ARG |pos=FW |name= Santiago Gómez}}

{{Fs end}}

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{{Fs player|no= |nat=ARG |pos=MF |name= Sebastián Medina|other=at Patronato until 31 December 2022}}

{{Fs player|no= |nat=ARG |pos=FW |name= Samuel Hernández|other=at Juventud Antoniana until 31 December 2022}}

{{fs end}}

• Torneo Argentino A: 2

:: Clausura 2007, 2010–11

• Torneo Argentino B: 1

:: 2002–03

• Liga del Valle: 13

:: Regional 1947, Oficial 1954, Preparación 1962, Preparación 1963, Preparación 1967, Oficial 1967,

:: Apertura 1996, Clausura 1999, Clausura 2000, Apertura 2001, Clausura 2002, Apertura 2005, Apertura 2013

{{Reflist}}

• {{Commons category-inline|Club Social y Atlético Guillermo Brown}}
• {{oweb|http://brown2000.com.ar}} {{in lang|es}}

{{Torneo Federal A}}

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