This document summarizes the proceedings of the 40th session of the UNFCCC Subsidiary Body for Implementation, held in Bonn from June 4-15, 2014. It discusses the organizational matters of the session, including adoption of the agenda. It also summarizes the discussions and outcomes on a wide range of agenda items, including reporting from Annex I and non-Annex I parties, mechanisms under the Kyoto Protocol, matters relating to least developed countries, national adaptation plans, and the Warsaw International Mechanism on Loss and Damage. Draft decisions from the session were forwarded to the Conference of the Parties for consideration and adoption.