Southern Asia may refer to:

• Indian Subcontinent, a physiographical region which encompasses the southern part of the Asian continent
• South Asia, a geopolitical macroregion of the SAARC countries, comprising Afghanistan and the Indian Subcontinent
• Southern Asia (UN geoscheme), the United Nations geoscheme's definition for a geographical subregion of Asia spanning the Indian Subcontinent and the Iranian Plateau, based on their close linguistic genetic relationships.