ENAlthough allowing justices of constitutional courts to publish their separate opinions has become a clear trend in Europe, until an amendment to the Law on the Constitutional Court in 2008, the justices of the Constitutional Court of the Republic of Lithuania did not have this possibility. However, after the introduction of this institution in Lithuania, criticism was voiced by the public regarding its legal regulation. Therefore, this article examines the legal regulation governing the institution of a separate opinion of a justice of the Constitutional Court, as well as the use of this institution in Lithuania. The article seeks to reveal the shortcomings of this regulation, as well as to provide proposals for its improvement. The issues in question are examined in the context of the legal framework governing the institution of a separate opinion in other European Union countries (with a particular focus on Eastern and Central European countries). In order to provide a basis for this research, the article also examines the institution of a separate opinion in the context of the principle of the secrecy of the deliberation room and the secrecy of voting results in the decision-making process of constitutional justice institutions. Keywords: separate opinion; Constitutional Court; dissenting opinion; constitution. [From the publication]