Aimo of Toul was a late 4th-century Catholic bishop who served as the second recorded leader of the diocese of Toul. Following the tenure of Saint Mansuy, he held his episcopal office from approximately 375 until his death, which is estimated to have occurred around 423. Although historical details regarding his life remain sparse, he is remembered for his penitential lifestyle and his connection to the forest of the Saintois, where he reportedly established a hermitage for his priests.