Al Sadd Sports Club (Arabic: نادي السد الرياضي) is a Qatari sports club based in the Al Sadd district of the capital city Doha. It is best known for its association football team, which competes in the top level of Qatari football, the Qatar Stars League. Locally, it is known primarily by the nickname \"Al Zaeem\", which translates to \"The Leader\". It is known as the best team in Qatar and is the only Qatari team that has won the AFC Champions League in Asia. In addition to football, the club has teams for handball, basketball, volleyball, table tennis, and athletics. Al Sadd is the most successful sports club in the country, and holds a national record of 64 official football championships.

The origin of Al Sadd's conception began with Al-Attiyah family members who excelled in football but did not wish to join any of the existing football clubs. After consulting the minister of Youth and Sports, the family, led by Ali Bin Hamad Al-Attiyah, decided to found the club on 21 October 1969 in Qatar's capital city, Doha.

In the 1989 season, they became the first Arab club side to triumph in the Asian Club Championship by defeating Al Rasheed of Iraq on an aggregate of away goals. Twenty-two years later, they won the 2011 AFC Champions League and earned a spot in the 2011 FIFA Club World Cup, in which Al Sadd finished third. They also earned a spot in the 2019 FIFA Club World Cup automatically as host club, in which Al Sadd finished sixth.