The Nowe Warpno Lake (German: Neuwarper See, Warper See;^[1] Polish: Jezioro Nowowarpieńskie) is a bay on the southern shore of the Szczecin Lagoon. It runs for about 6 kilometres (3.7 mi) into the interior and has two narrow channels to the lagoon in the north that are each only 150 metres (490 ft) wide and divided by a small island of reeds.

The west and south shores of the bay belong to the district of Vorpommern-Greifswald in the German federal state of Mecklenburg-Vorpommern, the east shore is part of the Polish West Pomeranian Voivodeship (Police County). On the Neuwarper See lie the municipality of Altwarp and the village of Rieth [de] in the municipality of Luckow, as well as the town of Nowe Warpno (Neuwarp) and its districts – Podgrodzie (Altstadt) and Karszno (Albrechtsdorf). The island of Riether Werder, 0.83 km² in area, lies in the German part of the Neuwarper See and is, like the entire shore between Altwarp and Rieth a nature reserve [de]. The island of Łysa Wyspa [pl] (Kahleberg) lies in Polish waters.

Passenger ferries run between Altwarp and Neuwarp all year round (6 trips each way from 10:00 to 17:30).