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The logging of personal data has been shown to offer many benefits for those wanting to, for example, get fitter, get stronger or get to know themselves better. In this chapter, we concentrate on the privacy values attributed to Quantified-Self (QS) data. Using evidence taken from research interviews, this chapter reviews privacy in relation to personal data and offers an empirical perspective on how QS users view and value the data they collect, and often display publically, as well as their attitudes towards the handling of their data by QS device manufacturers. We question appreciations of privacy in QS data and elaborate on how users value their QS privacy.