| Cosmo Maciocia | |
| Office1: | Borough mayor for Rivière-des-Prairies–Pointe-aux-Trembles and Montreal City Counciller |
| Term Start1: | 2005 |
| Term End1: | 2009 |
| Successor1: | Joe Magri |
| Office2: | Member of the National Assembly of Quebec for Viger |
| Predecessor2: | District was established in 1980 |
| Successor2: | Anna Mancuso |
| Term Start2: | 1981 |
| Term End2: | 2001 |
| Birth Date: | 2 February 1942 |
| Birth Place: | Cantalupo nel Sannio, Italy |
| Party: | Liberal Union Montréal |
| Children: | Alessia |
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.
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.