A collective agreement or collective bargaining agreement (CBA) is a special type of commercial agreement, usually as one negotiated "collectively" between management (on behalf of the company) and trades unions (on behalf of employees). The collective agreement regulates the terms and conditions of employees in their workplace, their duties and the duties of the employer. It is usually the result of a process of collective bargaining between an employer (or a number of employers) and a trade union representing workers.

Collective bargaining is a process of negotiation between employers and a group of employees aimed at reaching agreements to regulate working conditions. The interests of the employees are commonly presented by representatives of a trade union to which the employees belong. The collective agreements reached by these negotiations usually set out wage scales, working hours, training, health and safety, overtime, grievance mechanisms, and rights to participate in workplace or company affairs.