This practical guide will help scientific researchers navigate the core stages of their PhD writing journey, from refining their research question to structuring, editing and proofreading their thesis. The authors, both of whom have first-hand experience of working with PhD researchers, set out what's expected from PhD writing, help readers to establish good practice, and provide tips on how to overcome common roadblocks during the writing process. Chapters are enriched with insights from Nature editors and student researchers. Looking beyond the PhD, the book also features a chapter on writing for publication, which will help researchers to think about how to translate their research into high-impact journal articles and papers. This is an essential companion for all PhD researchers in the sciences.