Marcellinus of Gaul was a 4th-century North African cleric who served as the first bishop of Embrun. Born in Africa Proconsularis, he traveled to Rome alongside fellow bishops Vincent and Domnin to participate in a 313 synod regarding the Donatist movement. Following a mission from Pope Miltiades, he traveled through the Italian side of the Alps to preach the gospel. After preaching toward Vercelli, he eventually settled in Embrun to establish the local episcopate.