This seven-volume set, LNCS 16541-16547, constitutes the proceedings of the 45th Annual International Conference on the Theory and Applications of Cryptographic Techniques, EUROCRYPT 2026, held in Rome, Italy, during May 10&14, 2026. The 142 papers included in these proceedings were carefully reviewed and selected from 675 submissions. They are organized in topical sections as follows: Part I: Signatures; Quantum Cryptography Part II: Applied Cryptography Part III: Multi-Party Computation Part IV: Post-Quantum Cryptography Part V: Foundations Part VI: Symmetric Cryptography and Related Techniques Part VII: Zero-Knowledge; Hardware and Embedded Systems