Omar Bruno De Marchi (born 28 May 1966) is an Argentine lawyer and politician.

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.

[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.

[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.