Ondrej Laciak is a criminal lawyer specialised in the field of white collar crime, representing defendants and victims in the criminal proceedings. He is a partner in the law firm Laciak & Co. based in Bratislava, Slovakia.

Ondrej Laciak is an Advisory Board Member of the European Criminal Bar Association (ECBA) and a representative of the Slovak Bar Association in the Criminal Committee of the Council of Bars and Law Societies of Europe (CCBE). Ondrej is also Deputy Dean of the Faculty of Law at Comenius University in Bratislava. Since September 2016, he is listed as an ad hoc judge at the European Court of Human Rights for Slovakia.