Al Majma'ah (Arabic: المجمعة) is a city and a governorate in Riyadh Province, Saudi Arabia. It is located at around 25°54′14″N 45°20′44″E / 25.90389°N 45.34556°E / 25.90389; 45.34556, and it is the capital of the Sudair region. The city has an area of 30,000 square kilometres. The population of the town is around 70,000, while the population of the governorate as a whole is 151,877 (2022). Al-Majma'ah Governorate borders the Eastern Province and Al-Qassim Province to the north, Thadig and Shaqra to the south, Rumah to the east, and Al-Ghat and Al-Zulfi to the west.

Founded in 1417 CE by an immigrant from the Alshammari tribe, Al-Majma'ah was historically considered the capital of the region of Sudair. It was an attractive place for many tribes such as Anazah and Shammar compared to Southern Sudair cities that had tribes such as Banu Tamim. The city today contains a museum as well as an impressive mud-brick fort that dates to the 18th century.

The city is covered in green during spring, which makes it a national destination. The Afia sudair supermarket is famous in Al Majma'ah. There are many private farms consisting mostly of palm trees, but other fruits or vegetables can grow there such as citrus or berry.

Al Majma'ah is an important stop along the North-South line, which is operated by The Saudi Arabia Railways. This railway line links the city to major destinations such as Riyadh, Al-Qassim, Ḥaʼil, Al-Jawf, and Qurayyat, enhancing transportation and connectivity across the region.

Al Majma'ah is home to three prominent football clubs that share the city's main stadium, Al Majma'ah Sports City. These clubs are Al-Fayha, Al-Faisaly, and Al-Mujazzal. Al-Fayha and Al-Faisaly are particularly renowned for their strong home performances and have gained a reputation for being tough opponents to top teams in the Saudi Pro League. Both clubs have made significant history by winning the prestigious King's Cup, breaking the longstanding monopoly of the country's larger clubs in the competition. Their successes have solidified their place in Saudi football, highlighting Al Majma'ah as a city of competitive football talent.

• Adel al-Jubeir – Saudi Minister of State for Foreign Affairs
• Sheikh Abdulaziz al-Tuwaijri – Former deputy head of the National Guard

• List of cities and towns in Saudi Arabia
• Regions of Saudi Arabia