Hollihaka is a district of the city centre area of Oulu, Finland.

It is bounded by the estuary of the Oulujoki river to the west, the Vanhatulli district to the north, the Leveri district to the east and the Nuottasaari district to the south.

[2] Together with the two latter districts, Hollihaka forms a neighbourhood called Heinäpää.

Hollihaka is mainly residential area.

The Holy Trinity Cathedral of the Oulu Diocese of the Orthodox Church of Finland is located in Hollihaka.