The OECD Privacy Guidelines are the first internationally agreed-upon set of privacy principles and are recognized as the global minimum standard for privacy and data protection. They are a solid foundation for building effective protection and trust for individuals, and also for developing common international approaches to transborder data flows. Since their adoption, they have influenced legislation and policy in OECD countries and beyond. This document reproduces the two existing explanatory memoranda that accompany the OECD Privacy Guidelines. The first, published in 1980, was developed alongside the original version of the OECD Privacy Guidelines to help in their interpretation and application. The supplementary Explanatory Memorandum was developed to provide context and rationale for the revisions to the OECD Privacy Guidelines made in 2013.