This book, "Probabilistic Fatigue Life Analysis Methods for Aerospace Vehicles", is submitted by Yu Chee Tong to the School of Aerospace, Mechanical, and Mechatronics Engineering at the University of Sydney for the fulfillment of requirements for the degree of Doctor of Philosophy. Probabilistic approaches to fatigue life management in engineering structures have received tremendous attention in the past two decades particularly in the aerospace industry to improve fatigue management strategies for life extension, and to reduce the cost of operation of aircraft. The consequence and influence of this interest has now led to an increasing demand to migrate from the traditional deterministic approach to a probabilistic-based approach, and it appears inevitable that reliability-based design and management approaches as well as certification requirements would become the way of the future to managing aerospace vehicle structures and systems. In this book, new approaches are developed to address the deficiencies in the current probabilistic fatigue and Damage tolerance methodologies as applied to aerospace problems.