The Committee on Rules (or more commonly the Rules Committee) is a committee of the United States House of Representatives. It is responsible for the rules under which bills will be presented to the House of Representatives, unlike other committees, which often deal with a specific area of policy. The committee is often considered one of the most powerful committees as it influences the introduction and process of legislation through the House. Thus it has garnered the nickname the "traffic cop of Congress". A "special rule" resolution (also referred to simply as a "rule") is a simple resolution of the House of Representatives, usually reported by the Committee on Rules, to permit the immediate consideration of a legislative measure, notwithstanding the usual order of business, and to prescribe conditions for its debate and amendment.

The 'regular' process to pass a bill in the house is complicated and prone to delays and obstruction by the minority. Because of this, in practice, bills (other than those that are uncontroversial) are almost always debated under a so-called 'special rule' reported by the Rules Committee. This rule usually restricts the lengths of debate and number and type of amendments allowed (if any).

When a bill is reported out of another committee with legislative jurisdiction, it is placed on the appropriate House Calendar for debate. Common practice, though, is for bills reported from committees to be considered in the Rules Committee, which then passes a so-called "special rule" (a resolution allowing for consideration of a bill, establishing how long and under what rules the full body will debate the proposition). A "special rule" resolution (also known simply as a "rule") is privileged under the Standing Rules of the House, meaning it is immediately subject to a debate and a vote by the full House upon being reported by the Rules Committee. If a "special rule" resolution providing for consideration of a bill is passed, then such bill must be considered by the House at such a time and under such limitations as the resolution has set. In practice, a bill can get to a floor vote only if a "special rule" resolution providing for its consideration is passed (unless the Speaker grants a vote on suspension of the rules, which requires two-thirds of votes cast in order to pass).

Consideration by the full body can occur in one of two forums: the Committee of the Whole, or on the floor of the full House of Representatives itself. Different traditions govern whether the Committee of the Whole or the House itself will debate a given resolution, and the Rules Committee generally sets the forum under which a proposition will be debated and the amendment/time limitations for every measure, too. For instance, there might be a limit on the number or types of amendments (proposed changes to the bill). Amendments might only be allowed to specific sections of the bill, or no amendments might be allowed at all. Besides control over amendments, the rule issued by the Rules Committee also determines the amount of speaking time assigned on each bill or resolution. If the leadership wants a bill pushed forward quietly, for instance, there might be no debate time scheduled; if they want attention, they might allow time for lengthy speeches in support of the bill.

Between control over amendments, debate, and when measures will be considered, the Rules Committee exerts vast power in the House. As such, the majority party will usually be very keen on controlling it tightly. While most House committees maintain membership in a rough proportion to the full chamber (if the majority party controls 55% of the House, it will tend to have 55% of committee seats), membership on the Rules Committee is disproportionately in favor of the majority party. Furthermore, the rules committee typically operates in a very partisan fashion, advancing "special rule" resolutions to the floor on straight party line votes in nearly all cases.

The Rules Committee was formed on April 2, 1789, during the first Congress. However, it had nowhere near the powerful role it has today. Instead, it merely proposed general rules for the House to follow when debating bills (rather than passing a special rule for each bill), and was dissolved after proposing these general rules. These general rules still have a great impact on the tone of the House floor today.

The Rules Committee, for a long time, lay dormant. For the first fifty years of its existence, it accomplished little beyond simply reaffirming these rules, and its role was very noncontroversial. On June 16, 1841, it made a major policy change, reducing from 2⁄3 to 1⁄2 the fraction of votes needed in the House to close debate and vote on a bill.

In 1880, the modern Rules Committee began to emerge from the reorganization of the House Committees. When the Republican Party took over the House in the election of 1880, they quickly realized the power that the Rules Committee possessed. One member, Thomas Brackett Reed (R-Maine), used a seat on the Rules Committee to vault himself to the Speakership, and gained so much power that he was referred to as "Czar Reed".