Proastio (Greek: Προάστιο, before 1962: Παραπράσταινα - Paraprastaina[2]) is a Greek village in the northern part of the Karditsa regional unit, Greece.

Proastio was the seat of the former municipality Sellana.

It is located in a flat rural area, near the right bank of the river Pineios.

It is 14 km north of Karditsa and 14 km southeast of Trikala.