Technically Greek Cypriots are not refugees as you have to be forced to cross an international border to attain refugee status. Greek Cypriots are officially "internally displaced persons" but it doesn't mean they have any less rights under international law.
The UN used to referr to Greek Cypriots as refugees but I remember in 2004 Alvaro de Soto caused a bit of a stink when he said Greek Cypriots were not refugees but displaced persons.
"In its most recent resolution on this subject (1987/50), the Commission
reiterated its previous calls for the full restoration of all human rights to
the population of Cyprus, in particular to the refugees. It also
called for the tracing of and accounting for missing persons in Cyprus without
any further delay; and called for the restoration and respect of human rights
and fundamental freedoms of all Cypriots, including the freedom of movement,
the freedom of settlement and the right to property."
http://daccessdds.un.org/doc/UNDOC/GEN/ ... penElement
What is the difference between an internally displaced person and a refugee?
According to the 1951 Convention on the Status of Refugees, a "refugee" is a person who, "owing to well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group or political opinion, is outside the country of his nationality and is unable, or owing to such fear, is unwilling to avail himself of the protection of that country; or who, not having a nationality and being outside the country of his former habitual residence as a result of such events, is unable or, owing to such fear, is unwilling to return to it." Subsequent international instruments (such as the Cartagena Declaration on Refugees and the Convention Governing the Specific Aspects of Refugee Problems in Africa) have expanded this definition for some states to persons fleeing the general effects of armed conflict and/or natural disaster.
A crucial requirement to be considered a "refugee" is crossing an international border. Persons forcibly displaced from their homes who cannot or choose not to cross a border, therefore, are not considered refugees, even if they share many of the same circumstances and challenges as those who do.
What rights do internally displaced persons have?
Like all human beings, internally displaced persons enjoy human rights that are articulated by international human rights instruments and customary law. In situations of armed conflict, moreover, they enjoy the same rights as other civilians to the various protections provided by international humanitarian law.
http://www.ohchr.org/english/issues/idp/issues.htm