Al-Thumamah (), alternatively spelt as al-Thumama and pronounced as ath-Thumamah, is an arid lowland desert area situated in Wadi Thumamah at the edge of al-Armah mountains in the northeastern fringes of Riyadh in Riyadh Governorate, Saudi Arabia. Named after (), the Arabic word for desert bunchgrass, it is located approximately from Riyadh and is known for hosting outdoor recreational places, most notably the Thumamah National Park. The first census of the area was conducted in 1981 during the reign of King Khalid.
Recent archaeological excavations in the area trace the settlement's early existence to almost 8000 years ago, during the Neolithic period.