In this paper we explore the concept of ‘data collaboratives’ – cross sector partnerships to leverage new sources of digital data for addressing societal problems. Many of these new sources of digital data, such as “data exhaust” from mobile apps, search engines, personal sensors, are collected by companies. The paper identifies and defines the most important privacy challenges that need to be addressed in the context of data collaboratives. It provide guidance on how data can be successfully shared in data collaboratives while respecting data protection interests