Indutiomarus (died 53 BC) was a leading aristocrat of the Treveri (the people of the area around present-day Trier) at the time of Julius Caesar's conquest of Gaul.
To ensure adequate food supplies, Caesar had separated his troops into winter quarters dispersed in different parts of Gaul.
Indutiomarus encouraged Ambiorix and Cativolcus, chiefs of the Eburones, to attack the Roman legion stationed in their country; he himself soon afterwards marched against Titus Labienus, who was encamped among the Remi, immediately west of the Treveri.
Forewarned of Caesar's victory over the Nervii, Indutiomarus withdrew his forces into Treveran country and raised fresh troops.
Other peoples began sending ambassadors to Indutiomarus of their own accord as well – these included the Senones, the Carnutes, the Nervii and the Aduatuci.