Cohors prima Alpinorum equitata (1st part-mounted Cohort of Alpini) was a Roman auxiliary mixed infantry and cavalry regiment. Alpini was a generic name denoting several Celtic-speaking mountain tribes inhabiting the Alps between Italy and Gaul, which were organised as the Tres Alpes provinces. The regiment was probably raised as one of 4-6 Alpini units recruited after the final annexation of the western Alpine regions by emperor Augustus in 15 BC.