THis book constitutes the refereed proceedings of the 17th International Conference on Theorem Proving in Higher Order Logics, TPHOLs 2004, held in Park City, Utah, USA in September 2004.

The 21 revised full papers presented together with 2 invited papers were carefully reviewed and selected from 42 submissions. Among the topics addressed are theorem proving, verification, inductive types, automated deduction, mechanized proofs, mathematical logic, proof theory, type systems, computability, program verification, ACL, Cop, Isabelle/HOL, recursive functions, integration theory, machine code safety certification, and abstraction.