Tharmada (Arabic: ثرمداء [ALA-LC: Tharmadāʼ]) is a Saudi Arabian town, located about 170 kilometers north of the capital Riyadh.
The town is named after the plant Altharmad (Halexylon Salicornicum) which abounds in the region.
25°07′50″N 45°29′28″E / 25.13068°N 45.49112°E / 25.13068; 45.49112