|Municipality||Trakai district municipality|
|Capital of||Onuškis eldership|
|Time zone||EET (UTC+2)|
|• Summer (DST)||EEST (UTC+3)|
Onuškis (Polish: Hanuszyszki) is a town in Lithuania in the Trakai district municipality, around 30 km (19 mi) from Trakai and 16 km (9.9 mi) south of Aukštadvaris. As of 2001, it had 584 inhabitants and was the seat for the Onuškis eldership.
In the nineteenth century the Jews were the majority in the town. Before World War I about 80 to 90 Jewish families lived in there, but during the war years their number decreased to about 50 to 60 families.  On September 30, 1941, 1,446 Jews from Aukštadvaris, Lentavris, Onuškis, Rudziszki, Troki, Žydkaimis, and the surrounding areas were shot, after being abused, in the Varninkai Forest by a death squad of Lithuanian Activist from Aukštadvaris, Onuškis, and Lentvaris
- Vilniaus apskrities kaimo gyvenamosios vietovės ir jų gyventojai (PDF) (in Lithuanian). Vilnius: Department of Statistics to the Government of the Republic of Lithuania. 2003. p. 87. ISBN 9955-588-04-7.
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