委员会可以指：

• 一个机构或团体内一种集体决策的组织形式，每个成员（即「委员」）基本上都具有决策权，通常用以处理及决定一个机构或团体的特定事务或事件。此种组织形式常见于政府与公司治理中，如各国国会、内阁机关、公司决策单位等。其代表者或领导者通常称为「委员长」、「主任委员」、召集人或「主席」。
• 委员会制，是共和制政体的一种形式。

A committee (or "commission") is a body of one or more persons that is subordinate to a deliberative assembly. Usually, the assembly sends matters into a committee as a way to explore them more fully than would be possible if the assembly itself were considering them. Committees may have different functions and the type of work that each committee does would depend on the type of organization and its needs.