Elzéar Gérin, (14 November 1843 – 18 August 1887), was a politician in Quebec, Canada.
[1] Elzéar was born on in Yamachiche, Mauricie and was an attorney by vocation.
[2] He ran as a Conservative candidate in an 1868 by-election in the district of Saint-Maurice, but lost against another Conservative Élie Lacerte.
In 1871, Desaulniers became the Conservative Member of the Legislative Assembly for the district of Saint-Maurice.
He was appointed to the Legislative Council of Quebec in 1882 and died in office.