Vrachnaiika (, ) is a town and a former municipality in Achaea, West Greece, Greece. Since the 2011 local government reform it is part of the municipality Patras, of which it is a municipal unit. The municipal unit has an area of 32.111 km<sup>2</sup>. It is suburb of a Patras, about 11 km southwest of the city centre, on the Gulf of Patras coast. The community has a disused rail station on the line from Patras to Pyrgos. The Greek National Road 9 (Patras - Pyrgos) passes south of the centre.
The municipal unit Vrachnaiika is subdivided into the following communities (constituent villages in brackets):