Spa towns encompass various sizes and categories in eighteenth-century Britain. The role of health and medicine pervades social interactions in spa towns which abounded in urban spaces dedicated to sociability: the pump-room, the assembly rooms, the walks, villas and salons. Time was also structured socially through the seasons and the daily schedules: from dawn to dusk spa societies were regulated by the emblematic figure of the master of ceremonies. The entry ends on a more recent historiographical idea on the role of gender in spa societies, and their specificities as a place for soft politics.