Mr. Fidan was born on 15 July 1974 in Fatsa district of Ordu. He completed his primary, middle, and high school education in Ordu. He graduated in 1996 from the Faculty of Law of Ankara University in which he enrolled in 1992. He started public office as a candidate judge in Ankara in 1997. He served as a public prosecutor in Kayseri-Akkışla, Erzurum-Aşkale, Zonguldak-Çaycuma, Hatay-Dörtyol, İstanbul-Şişli and İstanbul respectively, upon successfully completing the training period in 1999. He was appointed as the public prosecutor authorised by Article 10 of the Anti-Terror Law in 2012. He held offices as the İstanbul Deputy Chief Public Prosecutor between 16 January 2015 and 26 July 2016. He then served as the İstanbul Chief Public Prosecutor until 27 November 2020.
He took office as a member of the Court of Cassation on 27 November 2020. He was appointed as a Justice of the Constitutional Court by the President of the Republic on 23 January 2021 and took office on 25 January 2021.
Mr. İrfan Fidan is married with two children.