We welcome unsolicited contributions from experts on international law, international relations, and cognate subjects. Most guest posts are written by scholars, lawyers, diplomats, and the like, but we judge each and every contribution on its own merits. We particularly welcome guest posts from women and from the Global South. Potential guest posts can be sent to any of the permanent members of Opinio Juris, including the Managing Editor and the Deputy Managing Editor, or to

Guest posts should be approximately 1,200-2,000 words long. A longer post is fine, but the contributor will be asked to divide it in two. Opinio Juris does not publish footnotes; use hyperlinks and/or internal parenthetical references instead. Please also send us a one-sentence bio and photo along with your proposed contribution.

All guest posts will be carefully vetted by the members of the blog. Contributors can expect to be asked to revise their posts at least once, and publication is never guaranteed. As with all professional writing, contributors must avoid making ad hominem attacks and using any language that could be construed as defamatory.

Guest posts must be submitted exclusively to Opinio Juris. We generally do not publish contributions that have already appeared somewhere else, unless the post was published in a language other than English. We also generally avoid allowing contributors to simultaneously cross-post, although exceptions will sometimes be made for a contributor’s personal blog or for a professional blog with a very different readership. Contributors must, however, obtain our permission before cross-posting elsewhere.