Although “equality of arms” is in its infancy in Quebec’s procedural law, its potential for growth seems immense. After defining its nature and identifying its legal basis—section 23 of the Quebec Charter of human rights and freedoms and the guiding principles of the Code of Civil Procedure—and following a brief examination of the few instances where it was resorted to in recent case law, the discussion focuses on the principle in international law. To that end, one must recall the analytical framework within which interlegality is considered, especially as it was recently reframed and refined. Indeed, the Supreme Court of Canada teaches that international normativity provides elements deemed “relevant and persuasive” or forming part of the context for the interpretation and application of domestic law, albeit a role that is limited to supporting or confirming (never contradicting) a conclusion based, first and foremost, on the text of the legislation. Moreover, the analysis ought to be differentiated according to the type of sources: binding or non-binding conventions, instruments prior or subsequent to domestic law, judgments of international or foreign courts. The second part of the paper proceeds with the study in substance of equality of arms, as developed pursuant to the conventions of the European regional systems and under the universal regime of the United Nations, and as articulated in the judicial decisions of international courts (European Court of Human Rights; Court of Justice of the European Union). It is then possible to assess that the Quebec judgments that referred to the principle were not mistaken: they considered equality of arms, at first, from a perspective of domestic law, with regard to section 23 of the Quebec Charter of human rights and freedoms and as per the guiding principles of the Code of Civil Procedure, and then only later looked into international law, with a view to supporting and confirming the meaning and scope of the principle. Although the emphasis of the paper is clearly international, the conclusion gives examples of application in Quebec’s procedural law. In the end, equality of arms shall be able to deploy fully pursuant to its internal basis, no doubt, but also drawing from international experience.