This chapter presents human-centered AI (HCAI) design principles for algorithmic nudging grounded in value-sensitive design, with a particular emphasis on transparency, user autonomy, and civic trust. Algorithmic nudges—subtle, choice-preserving interventions embedded within digital systems—shape users’ decisions, behaviors, and preferences by engineering the structure of digital choice environments. While such nudges may enhance usability and efficiency, they also introduce profound ethical concerns related to privacy, opacity, manipulation, and behavioral control. This chapter systematically examines the ethical dimensions of algorithmic nudging by reviewing current literature on its objectives, implications for personal autonomy, political ramifications, and broader societal impacts. Special attention is given to questions of accountability, particularly regarding the actors responsible for the design and deployment of these systems. Given that a single nudge can influence behavior at massive scale, the need for rigorous ethical oversight becomes urgent. Technological sophistication does not absolve moral responsibility; designers and institutions must ensure that these systems are aligned with democratic values and contribute to the development of a fair, sustainable, and equitable society.