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This chapter introduces basic concepts related to Internet of Things (IoT) data privacy, and discusses the approaches to IoT data privacy. It then describes the Privacy Preference Manager (PPM), which is an IoT data platform component that can provide data privacy by registering users’ consent and privacy preferences, providing a way to modify or update them, providing rules for data flow according to users’ preferences, and recording all transactions. Next, the chapter discusses how the emergence of IoT is impacting data privacy, and describes some existing approaches to address both online‐ and IoT‐related privacy. It further provides information on a generalized personal data handling architecture for IoT that fulfills the requirements identified along with a description of how this has been realized by the oneM2M IoT platform standard and in particular its PPM component.