Haven Greenacres (also known as Greenacres Holiday Park) is a Haven-operated holiday park situated on the Llŷn Peninsula in North Wales, near Porthmadog, alongside the Blue Flag beach at Black Rock Sands.

The park holds an AA 5 Star Holiday Park rating and is open from March through January.

The park offers a range of on-site facilities including an indoor swimming pool, an outdoor SplashZone, a climbing wall, a bungee trampoline, children's play areas, and an entertainment venue.

Caravan ownership is also available on site, with a sister park, Garreg Wen, whose owners have access to Greenacres' facilities.

The surrounding area provides easy access to Snowdonia National Park, the Ffestiniog Railway, Portmeirion, and Porthmadog Golf Club, making it a well-placed base for exploring North Wales.