Agios Ioannis Renti (Greek: Άγιος Ιωάννης Ρέντη) is a suburb and a former municipality in the Piraeus regional unit, lying in the western part of the Athens agglomeration, Greece.

[3] Agios Ioannis Renti is part of Piraeus regional unit, part of Athens urban area, located about 4.5 km (3 mi) west of central Athens and 4 km (2 mi) northeast of Piraeus.

Two important transport axes pass through the municipality: the A1 motorway (Athens–Thessaloniki–Evzonoi) and the Piraeus–Platy railway, on which it has a passenger station (Rentis) and a large marshalling yard.

Agios Ioannis Renti was part of the municipality of Athens until 1925 when it became a separate community.

[7][8] In Agios Ioannis Renti is located one of the most important industrial areas of Athens, in which factories of important companies are based, such as Rolco (Biggest detergent manufacturing company in Greece),[9] Mietsel,[10] Pharmasept[11] and others.