Sergio Matías Oga (born 15 September 1981) is an Argentine professional footballer who plays as a midfielder for Gimnasia y Esgrima.

[1] General Paz Juniors were Oga's second team, they signed him from Club Atlético Las Flores.

[2] He featured for the Torneo Argentino A side eighty-six times whilst netting seventeen goals.

[3] Having netted eight times in the subsequent Torneo Argentino A campaign, Oga left to sign for Central Norte in 2009.

[1] He departed on 20 January 2016 for a short stint back with Central Norte - where he took his overall tally for the club to nineteen goals in one hundred and four encounters - prior to rejoining Gimnasia y Esgrima in June.