The public transport sector has been experiencing a rapid shift towards ‘intelligent mobility’ via the integration of technology and new forms of data to inform research, planning, and service provision. With increasing use of smartphones, smart cards, and technology-enabled service platforms, data resources have also become more personal, reflecting the habits, behaviours, and preferences of individual users at a high level of spatial and temporal detail. While these new data resources promise benefits for the effectiveness of public transport services, they also introduce heightened concerns about data privacy. This chapter explores emerging privacy considerations in the public transport space, including the influence of trust in willingness to share data, transparency in the communication of data practices, new regulatory requirements, and how these issues may impact the use of big data in the transport sphere. Issues related to data privacy in the context of MaaS are highlighted.