Behaviour refers to the actions of a system or organism, usually in relation to its environment, Behavior management is similar to behavior modification. In behavior modification the focus is on changing behavior, while in behavior management the focus is on maintaining order. This chapter deals with the behaviour and behaviour management of a child and objectives of behaviour management. It explains types of behaviour, all the factors influencing child’s behaviour in dental office, environment of the dental office and role of dentist in child’s behaviour. It also explains the maternal attitude, effect of the mother’s presence in operatory. There is various classification of child’s behaviour in the dental office, various behaviour management techniques. It also deals with pre-anesthetic medication and conscious sedation.