A committee of the whole is a meeting of a legislative or deliberative assembly using procedural rules that are based on those of a committee, except that in this case the committee includes all members of the assembly. As with other (standing) committees, the activities of a committee of the whole are limited to considering and making recommendations on matters that the assembly has referred to it; it cannot take up other matters or vote directly on the assembly's business. The purpose of a committee of the whole is to relax the usual limits on debate, allowing a more open exchange of views without the urgency of a final vote. Debates in a committee of the whole may be recorded but are often excluded from the assembly's minutes. After debating, the committee submits its conclusions to the assembly (that is, to itself) and business continues according to the normal rules.

In legislative assemblies, the committee stage of important bills is typically conducted by the committee of the whole, whereas lesser bills may be considered in smaller committees.