Semeliškės is a town in Elektrėnai municipality, Vilnius County, east Lithuania. According to the 2001 census, the town has a population of 660 people. The town has a church of Catholics and Orthodox church of St. Nicolas.
Its alternate names include Sameliškės, Semelishkes, Semelishkis, Semeliškių, Sumelishki, Sumilishki, Siemieliszki, and Sumiliszk.
Memorial at the execution site of the Jews of the town.
On October 6, 1941, 962 Jews of the town were murdered in a mass execution perpetrated by an Einsatzgruppen of local policemen and Lithuanian nationalists.