This article surveys selected decisions of international criminal courts and tribunals, and related literature, examining custom from a general standpoint. This article considers the place and nature of custom, with a particular focus on challenges levelled against custom’s suitability in international criminal law. This article also analyses custom’s ‘structure’, and, more specifically, the application of the ‘two-element approach’ by international criminal courts and tribunals. This articles then discusses claims that international criminal courts and tribunals engage in sui generis customary law-making, and revisits the distinction between custom in foro and in pays, examining that distinction’s pertinence to assessing such claims. Having emphasised the influence of general international law on international criminal law, this article lastly reverses its focus, and addresses custom’s wider functions as source for rules on custom’s identification and, more generally, other sources’ recognition, showing how some decisions of international criminal courts and tribunals elucidate those wider functions.

本文对国际刑事法院和法庭的某些决定以及相关文献进行了调查，从大体上考察了风俗习惯。本文考虑了习惯的位置和性质，特别关注了针对习惯在国际刑法中的适用性所面临的挑战。本文还分析了习俗的“结构”，更具体地说，是国际刑事法院和法庭对“二元方式”的应用。这篇文章的讨论则声称，国际刑事法院和法庭从事特殊习惯法制定和回访定制之间的区别福罗卢卡并在支付，检查该区别与评估此类声明的相关性。在强调了一般国际法对国际刑法的影响之后，本文最后扭转了其重点，并探讨了海关作为海关识别规则和更广泛的其他来源的认可规则来源的更广泛的功能，展示了国际刑事法院的某些裁决法庭阐明了这些更广泛的职能。