Wakabayashi-ku (若林区?) is a ward located in Sendai in Miyagi, Japan.
As of 2005, the ward has an estimated population of 130,478 and the population density of 2609.56 persons per km². The total area is 50 km². In the aftermath of the 2011 Tōhoku earthquake and tsunami, the area was severely damaged, especially in Arahama district, where almost all 2,700 houses were destroyed and swept away by tsunamis.
Coordinates: 38°14′39″N 140°54′3″E / 38.24417°N 140.90083°E