Retainer may refer to: Retainer (orthodontics), devices for teeth RFA Retainer (A329), a ship Retainers in early China, a social group in early China Employment Retainer agreement, a contract in which an employer pays in advance for work, to be secured or specified later, when required Domestic worker or servant, especially one who has been with one family for a long time (chiefly British English) Affinity (medieval), also Retinue, a person or group gathered around in the service of a lord See also RETAIN, a mainframe-based database system Retainer sacrifice, the sacrifice of a human servant Retainer medicine, a relationship between a patient and a primary care physician in which the patient pays an annual fee or retainer Retention (disambiguation)