Mulasarvastivada

thumb|Tibetan Buddhism|Tibetan Buddhist bhikṣus of the Mūlasarvāstivāda ordination lineage

The Mūlasarvāstivāda (; ) was one of the early Buddhist schools of India. The origins of the Mūlasarvāstivāda school and their relationship to the Sarvāstivāda remain largely unknown, although various theories exist.