If you are interested to learn Greek here is a list with Organizations and Universities in Greece with special Greek language programs

If you are interested to learn Greek in Greece, there are the special Greek language programs - particularly summer - with or without a scholarship

Universities:
National and Kapodistrian University of Athens, the Modern Greek Language http://en.greekcourses.uoa.gr/
National and Kapodistrian University of Athens, Greek Studies Summer Scholarships (THYESPA) http://www.thyespa.uoa.gr/8yespa-2013/genika.html
Aristotle University of Thessaloniki, School of Modern Greek Language http://smg.web.auth.gr/
University of Ioannina, International Centre for Greek Education - Delivery and Vocational Education (DI.K.E.P.P.E.E.) - "Stavros Niarchos" http://dikeppee.uoi.gr/?q=en
Patras University, Center for Intercultural Education http://www.inpatra.gr/georgogiannis/greekschool.php
Organizations:
Peninsula Foundation for Balkan (Balkan Studies), Thessaloniki http://www.imxa.gr/
Greek Culture Center http://www.hcc.edu.gr/
Ikarian Centre, Greek Language Courses http://www.greekingreece.gr/?lang=en
Institute of Alexandria, Athens http://www.alexandria-institute.com/el/%cf%83%cf%87%ce%bf%ce%bb%ce%b5%ce%af%ce%bf-%ce%b5%ce%bb%ce%bb%ce%b7%ce%bd%ce%b9%ce%ba%cf%8e%ce%bd/
MGA (Modern Greek Academy), The Greek as a foreign language, Corfu http://www.moderngreekacademy.com/
Vardakeio School Ermoupolis, Syros www.vardakeios.gr