Olstappen
Olstappen Location of the lake Show map of Innlandet Olstappen Olstappen (Norway) Show map of Norway
Location	Nord-Fron Municipality, Innlandet
Coordinates	61°28′43″N 9°22′58″E / 61.47863°N 9.38264°E / 61.47863; 9.38264
Primary inflows	Vinstra River, Espa River
Primary outflows	Vinstra River
Basin countries	Norway
Max. length	5 kilometres (3.1 mi)
Max. width	1.2 kilometres (0.75 mi)
Surface area	3.15 km2 (1.22 sq mi)
Shore length1	13.88 kilometres (8.62 mi)
Surface elevation	662 metres (2,172 ft)
References	NVE[1]
1 Shore length is not a well-defined measure.

Olstappen is a lake in Nord-Fron Municipality in Innlandet county, Norway. The southeastern shore of the lake forms the municipal border with Sør-Fron Municipality. The 3.15-square-kilometre (1.22 sq mi) lies about 2 kilometres (1.2 mi) south of the village of Skåbu.

The Vinstra river, coming from the southwest, flows into the west side of Olstappen and flows out of Olstappen's northeast corner, and from there it heads east into the Gudbrandsdalslågen river at the town of Vinstra. The Espa River flows into Olstappen from the south, making it a tributary of the Vinstra.

• List of lakes in Norway