Osmar Daniel Malevo Ferreyra (born 9 January 1983) is an Argentine football midfielder. He plays for River Plate in the Argentine Primera División.
Ferreyra started his career with River Plate. He was signed by PFC CSKA Moscow in January 2004. In January 2005, he joined PSV Eindhoven on loan, but he returned to CSKA in December 2005. In 2006, he joined San Lorenzo, where he helped the team to win the 2007 Clausura.
In January 2008, he moved to Dnipro Dnipropetrovsk.
In July 2011, he signed a 3-year deal with Independiente, back in his native country.
On 2 July 2013, Osmar was confirmed as a new River Plate player, club where he made his debut under the same coach who called him again, Ramón Díaz. He signed for 2 years.
Ferreyra was capped for the Argentina Under-20 team during the 2003 FIFA World Youth Championship. He also played for the Argentina U-23 team.