The present article addresses the issue, whether in international law there exists pre-contractual responsibility (culpa in contrahendo). If such a responsibility indeed exists it will play a significant role not only in State-to-State relations, but also in the relations between States and private investors, given the fact that currently, on the virtue of investment treaties, private entities have rights to lodge claims against states before arbitration tribunals, which employ international law in their judgements. Hence, determination whether responsibility for culpa in contrahendo exists in international law, will allow to establish, whether private entities may base the claims on that ground, and if such course of action is advantageous. The proposed analysis will be based upon sources of international law, such as treaties, custom, general principles of law, as well as judicial and scientific authorities – and additionally also relevant practice in chosen States’ legal practice.