Osmar Barba Ibáñez (born 5 June 1988), known as simply Osmar, is a Spanish footballer who plays for Korean club FC Seoul as a central defender or a defensive midfielder.

Born in Santoña, Osmar was a product of local Racing de Santander's youth system. After a successful loan stint with CD Salmantino in Tercera División he returned to his first club for 2008–09, making his senior debuts with the reserves in Segunda División B and being his team's top scorer; he suffered relegation in the following season.

On 8 November 2009 Osmar made his debut with the Cantabrians' first-team, starting in a 0–2 La Liga home loss against Athletic Bilbao. He was definitely promoted to the main squad for the 2010–11 campaign, but appeared in only 12 more games in two seasons combined, with the second ending in relegation.

On 25 July 2012 Osmar signed a two 1/2-year contract with Thai club Buriram United FC, for an undisclosed fee. He made his debut on 1 August, appearing in a Thai FA Cup match against Chonburi and going on to win both that tournament and the Toyota League Cup in his first year.

On 26 February 2013 Osmar made his debut in the AFC Champions League, in a match against Vegalta Sendai, acting as team captain and scoring a goal in the 1–1 away draw. On 1 May Buriram became the first team from the nation in a decade to reach the knockout rounds of the AFC Champions League, and he topped his side's scorers list at three.

On 31 December 2013 Osmar moved teams and countries again, joining FC Seoul on a three-year deal and becoming the first Spanish footballer to ever play in South Korea. He has been appointed as vice-captain for the 2015 season.