The Aquincum Museum houses the fragments of a terracotta object belonging to the finds unearthed in the so-called Symphorus Mithraeum. Careful study and following restoration of the object, previously identified as an architectural ornament in the museum inventory book, made it clear that the fragments belonged to a terracotta sculpture. The surviving parts of the hollow terracotta sculpture suggest that it was a representation of Mithras. This paper does research on which scene in Mithraic iconography this rare terracotta depiction of Mithras was an element of; whether the object can be connected to any other terracotta sculptures of gods originating from the cult place; and whether it was once part of the shrine equipment.