This book constitutes the refereed proceedings of the 11th International Conference on Machines, Computations, and Universality, MCU 2026, held in Trier, Germany, during July 27–29, 2026. 

The 18 full papers and 3 invited papers included in this book were carefully reviewed, revised, and selected from 31 submissions.

The scope of the conference topics includes, but is not limited to, computation in the setting of various discrete models (Turing machines, register machines, cellular automata, tile assembly systems, rewriting systems, molecular computing models, neural models), analog and hybrid models (BSS machines, infinite time cellular automata, real machines, quantum computing), and the meaning and implementation of universality in these contexts.