| En Name: | Vasilsursk |
| Ru Name: | Васильсурск |
| Other Name: | Шурдӱҥ |
| Other Lang: | Mari |
| Coordinates: | 56.1275°N 46.0072°W |
| Map Label Position: | right |
| Image Coa: | Vasilsursk COA (Nizhny Novgorod Governorate) (1781).png |
| Holiday: | Second Sunday of August |
| Federal Subject: | Nizhny Novgorod Oblast |
| Adm District Jur: | Vorotynsky District |
| Inhabloc Cat: | Urban-type settlement |
| Inhabloc Type: | Work settlement |
| Pop 2010Census: | 1068 |
| Established Date: | 1523 |
| Postal Codes: | 606263 |
| Dialing Codes: | 8316432 |
| Website: | http://www.vasilsursk.ru/ |
| Date: | November 2010 |
Vasilsursk (Russian: Васильсу́рск) is an urban locality (a work settlement) in Vorotynsky District of Nizhny Novgorod Oblast, Russia, located on the Sura River, not far from its fall into the Volga.
A Kuruk Mari (a tribe of Mari people) wooden fortress named Tsepel used to stand where Vasilsursk is now located. Russians captured it after bloody fight in 1523 from Kuruk Maris and established on its site a small settlement. The fort here was used as an advanced base during the Russo-Kazan Wars.
Vasilsursk has a humid continental climate (Köppen climate classification Dfb) with long cold winters and warm, often hot dry summers. The warmest month is July with daily mean temperature near, the coldest month is January .
In warmer months, a ferry operates between Vasilsursk and the settlement of Lysaya Gora. During winter, passengers are transported by amphibious boats Khivus-10.
The Sura Ionospheric Heating Facility, an ionospheric research facility, is located near Vasilsursk.