npj Complexity is an online Open Access journal publishing high-quality peer-reviewed research in all aspects of complexity and aiming to foster dialogue across domains and expertise.

Inspired by themes explored at the Conference on Complex Systems 2025, this Collection wish to explore advances in theory, methods, and applications that redefine complexity science across different scales and disciplines.

Collection "Decision-making in Structured Groups: from animal societies to human governance" hopes stimulate new dialogues and translational efforts, to fully capture the rich diversity of ways collectives solve complex problems in nature.

Collection "Unnatural Histories: Investigating the Improbable with Experimental Evolution and Artificial Life" invites submissions that employ experimental and theoretical approaches to investigate life's alternative possibilities. Through this collection, we aim to expand our understanding of both life as it is and life as it could be.