He served a term as Prime Minister of nearly 17 years, by this he was the longest serving Prime Minister of the country. He also holds the record of longest serving MP.
Eroğlu entered the Assembly of the Republic of the then-Turkish Federated State of Northern Cyprus in 1976, serving as Minister of Education, Culture, Youth and Sports during 1976–77. He served as member of the de facto Northern Cyprus (TRNC) Constituent Assembly in November 1983.[5] As the leader of the National Unity Party (UBP), he was appointed prime minister in four successive governments between 1985 and 1993 (he was opposition leader between 1994 and 1996), and from 1996 until his party lost the general election to the Republican Turkish Party under Mehmet Ali Talat in 2004. Eroğlu's UBP won the majority of seats in the legislative election of 18 April 2009, and Eroğlu became prime minister again.[6]
On 21 November 2005, Eroğlu resigned as leader of the UBP, stating that "it was time for younger blood to take control", but was re-elected to the chair in November 2008.[7] Eroğlu was elected to the office of President of Northern Cyprus on 18 April 2010. Because the UN does not recognize the TRNC, it regards Derviş Eroğlu as bona fide negotiator for the Turkish Cypriot community of the Republic of Cyprus.