Kareika (, also: Καράιικα - Karaiika) is a village and a community in the municipal unit of Movri, Achaea, Greece. The community consists of the villages Kareika, Gomosto, Karamesineika and Rachi. It is located north of the Movri hills, 3 km east of Sageika, 6 km southwest of Kato Achaia and 25 km southwest of Patras. The Greek National Road 9/E55 (Patras - Pyrgos) passes through the community.
Population
{| class=wikitable
! Year !! Population village !! Population community
|-
| 1981 || - || 829
|-
| 1991 || 225 || -
|-
| 2001 || 237 || 947
|-
| 2011 || 174 || 726
|-
| 2021 || 147 || 661
|}
The population in 2021 by village: