The American Contract Bridge League (ACBL) is a governing body for contract bridge in the United States, Canada, Mexico, and Bermuda. It is the largest such organization in North America having the stated mission "to promote, grow and sustain the game of bridge and serve the bridge-related interests of our Members." Its major activities are:

As of 2025^[update], it had more than 130,000 members.

The ACBL was created in 1937 by the merger of the American Bridge League and the United States Bridge Association in 1937. At that time, its bridge tournaments were open only to white people, with the American Bridge Association running tournaments in which black people were allowed to play. In 1967, the American Contract Bridge League (ACBL) removed the final obstacle to ACBL membership for African-Americans when it included in its by-laws a rule that no person could be denied membership because of race, color, or creed.

A not-for-profit organization, the ACBL was founded on December 23, 1937 in New York City and later moved its company headquarters to Greenwich, Connecticut, then to Memphis, Tennessee in 1971 and to Horn Lake, Mississippi in 2010. It has a full-time staff of about 60 employees in Horn Lake, plus about 160 tournament directors throughout the country. The headquarters also houses the League's Museum, Library and League's Hall of Fame.

Three times a year, in the spring, summer, and fall, the ACBL holds the North American Bridge Championships (NABC) using the duplicate bridge method of scoring, which greatly reduces the element of luck in competition. The NABC typically extends over eleven days and includes many different events. The location of the NABC is rotated among major cities and is attended by thousands of players.

For many, the most significant role of the ACBL is its sanctioning of club games and tournaments to award masterpoints. Players who finish at or near the top in ACBL-sanctioned events are awarded specified numbers of masterpoints, which are recorded by the League. Many players value the increase in their masterpoint totals as a measure of their success at the game. Unlike the Elo rating system developed for chess, the masterpoint system is strictly one of accumulation; players' masterpoint totals never decline (except as a penalty imposed for an ethics violation).

Members receive the monthly Bridge Bulletin magazine.

In addition to the Laws of Duplicate Bridge (named Laws of Duplicate Contract Bridge until 2008), the ACBL offers many other training and information resources at its official website including software supporting education and play of the game,