Cosmo Maciocia (born February 2, 1942) is a Canadian politician. He was a member of the National Assembly of Quebec and a city councillor in Montreal, Quebec.^[1]

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He was born in Cantalupo nel Sannio, Molise, Italy, on February 2, 1942, and arrived in Canada in 1964.

He was a city councillor in Saint-Léonard in 1978.

He successfully ran as a Liberal candidate to the provincial legislature for the district of Viger in 1981. He was re-elected in 1985, 1989, 1994 and 1998.

He was Parliamentary Assistant from 1985 to 1994.

In the wake of the province-wide municipal merger of 2001, Maciocia gave up his seat and ran as a candidate of Gérald Tremblay's Montreal Island Citizens Union (French: Union des citoyens et des citoyennes de l'Île de Montréal or UCIM) in the district of Marc-Aurèle-Fortin. The party is now known as Union Montréal.

In 2005, he was elected as borough mayor for Rivière-des-Prairies-Pointe-aux-Trembles-Montréal-Est, and retained his position as mayor of Rivière-des-Prairies–Pointe-aux-Trembles following the 2006 demerger of Montréal-Est.

Maciocia is a member of Montreal's executive committee.

He did not choose to run again in the 2009 Montreal municipal election, but his seat was retained for Union Montréal by Joe Magri.