This book constitutes the proceedings of the 15th International Conference on Swarm Intelligence, ANTS 2026, which took place in Darmstadt, Germany, during June 8–10, 2026.

The 21 full papers and 21 short papers included in this book were carefully reviewed and selected from 93 submissions. The proceedings also include13 extended abstracts which can be found in the back matter of the book. 

The ANTS 2026 proceedings focus on advances in the field of swarm intelligence presenting significant, original research from researchers and practitioners of any area related to swarm intelligence. The theme of the 2026 proceedings is "reaching beyond - swarm intelligence across systems, disciplines, and communities"