| Omar De Marchi | |
| Office: | First Vice President of the Chamber of Deputies |
| Term Start: | 10 December 2020 |
| Term End: | 10 December 2023 |
| President: | Sergio Massa Cecilia Moreau |
| Predecessor: | Álvaro González |
| Successor: | Cecilia Moreau |
| Office1: | National Deputy |
| Term Start1: | 10 December 2020 |
| Term End1: | 10 December 2023 |
| Constituency1: | Mendoza |
| Term Start2: | 10 December 2005 |
| Term End2: | 10 December 2013 |
| Constituency2: | Mendoza |
| Office3: | Mayor of Luján de Cuyo |
| Term Start3: | 10 December 2015 |
| Term End3: | 6 December 2019 |
| Predecessor3: | Carlos López Puelles |
| Successor3: | Sebastián Bragagnolo |
| Term Start4: | 10 December 1999 |
| Term End4: | 10 December 2005 |
| Predecessor4: | Luis Humberto Carral |
| Successor4: | Omar Parisi |
| Birth Date: | 28 May 1966 |
| Birth Place: | Luján de Cuyo, Argentina |
| Alma Mater: | National University of Córdoba |
Omar Bruno De Marchi (born 28 May 1966) is an Argentine lawyer and politician. He served as a National Deputy elected in Mendoza Province on two occasions, from 2005 to 2013 and later from 2019 to 2023.
De Marchi previously served as intendente (mayor) of Luján de Cuyo on two occasions, from 2015 to 2019 and from 1999 to 2005. He is the leader of PRO in Mendoza and first vice president of the Chamber of Deputies.
De Marchi was born on 28 May 1966 in Luján de Cuyo, Mendoza Province. He studied law at the National University of Córdoba, graduating in 1991, and has a master's degree in Business Administration from Universidad Francisco de Vitoria.[1] He is married and has two children.[2]
De Marchi was originally a member of the Democratic Party of Mendoza. He was elected to the mayoralty of his hometown in 1993, and served two terms until 2005.[2] In 2005, De Marchi was elected to the Argentine Chamber of Deputies on the PD–Recreate for Growth list.[3] He was re-elected in 2009, this time as part of the PRO Union alliance, a precursor of Republican Proposal.[4]
In 2015, De Marchi was elected once again as mayor of Luján de Cuyo.[5]
In 2019, De Marchi ran for a seat in the Argentine Chamber of Deputies as the third candidate in the Cambia Mendoza list; the list received 52.44% of the vote and De Marchi was elected.[6] In 2020, De Marchi was elected First Vice President of the Chamber of Deputies.[7]