This book constitutes the proceedings of the 39th International Conference on Architecture of Computing Systems, ARCS 2026, held in Mainz, Germany, during March 24–26, 2026.The 35 full papers, 4 papers of the PhD Forum and 5 papers of the Research Group Forum included in this volume were carefully reviewed and selected from 57 submissions.Out of the 35 full papers, 20 were accepted for the Main track, 3 for the track on Dependability and Fault Tolerance, and 12 papers for the track on Organic Computing.

This book constitutes the proceedings of the 39th International Conference on Architecture of Computing Systems, ARCS 2026, held in Mainz, Germany, during March 24–26, 2026.The 35 full papers, 4 papers of the PhD Forum and 5 papers of the Research Group Forum included in this volume were carefully reviewed and selected from 57 submissions.Out of the 35 full papers, 20 were accepted for the Main track, 3 for the track on Dependability and Fault Tolerance, and 12 papers for the track on Organic Computing.

This book constitutes the proceedings of the 39th International Conference on Architecture of Computing Systems, ARCS 2026, held in Mainz, Germany, during March 24–26, 2026.The 35 full papers, 4 papers of the PhD Forum and 5 papers of the Research Group Forum included in this volume were carefully reviewed and selected from 57 submissions.Out of the 35 full papers, 20 were accepted for the Main track, 3 for the track on Dependability and Fault Tolerance, and 12 papers for the track on Organic Computing.