The OECD expects Spain's unemployment level to hit 27.8 towards the end of 2014, the organization said in a report published on Tuesday.
There was also a danger that the large number of long-term unemployed people in Spain could result in cyclical unemployment becoming structural, the organization said in its Employment Outlook 2013 report.
The OECD highlighted the fact that Spain's rate of long-term unemployment (12 months or more without work) had been steadily rising for some years.
In the last quarter of 2007, 19.1 percent of unemployed people in Spain had been out of work for a year or more.
But this figure had ballooned to 47 percent of Spain's jobless by the end of 2012.
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