The objective of this dissertation is to study the applicability of complex project management methodologies at Petrobras, in an increasingly challenging scenario for organizations. Concepts related to project management, complexity and complex projects are presented, and its compatibility with the major challenges encountered in Petrobras strategic planning is substantiated. The work examines three methods for managing complex projects, as an alternative to the traditional forms of project management. The importance of a holistic perspective to the success of projects of great complexity is highlight, as a way to keep the synergy between these projects and the strategic planning process of the company. The need for an integrative organizational area, which would enable the operationalization of corporate strategy in the implementation of complex projects, is identified. At the end, the elements of the methodologies formulated to deal with complexity that contributes to the achievement of the desired integrated vision, are shown.