Oscar Alcides Mena Fernández (born 30 November 1970), nicknamed El Mencho, is an Argentine retired footballer who played as a defensive midfielder, and is a manager.
Subsequently, Mena signed with Atlético Madrid, where he faced stiff competition for a starting job and also suffered from injuries.
He resumed his career in Spain in its second, third and fourth tiers, with a quick return to Argentina with Olimpo de Bahía Blanca in between.
Mena retired from the game in February 2005, making a return to Atlético Madrid later on, appearing for its indoor soccer side.
On 10 February 2014, following a division three loss at CD Sariñena which left Atlético Madrid B in the relegation zone, Mena replaced Alfredo Santaelena, who had also played for the club in the 90s, as head coach.