The Committee of the Whole House is a committee of the House on which all Representatives serve and which meets in the House Chamber for the consideration of measures from the Union calendar. However, it is governed by different rules of procedure than the House meeting as itself. The concept of the "grand committee" has been carefully developed from the early days of the House and in modern practice gives the House a more expeditious means for considering the complex and often controversial legislation referred to it.

Historically it was devised by the English House of Commons to give them the ability to debate privately and not have their votes committed to record. The Committee of the Whole in the U.S. House, however, has permitted recorded votes since January 1971. The House resolves itself into a new Committee of the Whole for the consideration of a bill. A specific Committee of the Whole is dissolved when it "rises and reports with a recommendation," to the House. When the Committee rises after not having resolved the matter committed to it, that bill is carried on the calendar as "unfinished business of the Committee of the Whole" until consideration has been finally completed.