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.

This unique Collection aims to be an ongoing repository of resources for the pedagogy of complexity and for complexity in pedagogy.

Collection "Variational, Nonequilibrium, and Optimization Principles of the Coevolution of Structure and Dynamics in Complex Systems" aims to gather theoretical, computational, and empirical contributions that advance the use of variational principles to explain and predict structure–dynamics interplay in complex systems.

Inspired by themes explored at the Conference on Complex Systems 2025 (CCS25), this collection aims to explore advances in theory, methods, and applications that redefine complexity science across different scales and disciplines.