Gröndalsviken is a station on Stockholm's commuter rail network, located in the Estö/Gröndal district of central Nynäshamn, 62.4 km from Stockholm Central Station and 1.5 km from Nynäshamn station along the Nynäs Line.

[4] The station consists of a single side platform along a single track and lacks a ticket hall or fare gates.

The area surrounding Gröndalsviken includes a park-and-ride facility.

As of 2015, the station had approximately 700 boardings per weekday.

Along with Bålsta, it is one of the only commuter rail stations in Stockholm with a single track.