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Julien Cosmao
Portrait of Julien Cosmao by Auguste Mayer
Native name	Julien Marie Cosmao-Kerjulien
Nickname(s)	« Va de bon cœur »
Born	27 November 1761 Châteaulin, Finistère
Died	17 February 1825 Brest, France
Buried	St Martin Cemetery, Brest
Allegiance	Kingdom of France Kingdom of the French French First Republic First French Empire
Service / branch	French Navy
Years of service	1776 – 1816
Rank	Counter admiral
Commands	Le Tonnant, Le Pluton

Julien Marie Cosmao-Kerjulien (27 November 1761 – 17 February 1825) was a French Navy officer best known for his actions during the Battle of Trafalgar.