Sviatoslav Ivanovych "Slava" Vakarchuk (Ukrainian: Святослав Іванович Вакарчук; born 14 May 1975) is a Ukrainian musician, politician, public activist and soldier. He is the lead vocalist of Okean Elzy, a rock band in Ukraine. Vakarchuk is a former member of the Ukrainian parliament, and the founder of the Voice (in May 2019).

Vakarchuk was active in supporting the Orange Revolution and Euromaidan, and is involved in many social and cultural projects. He is one of the most successful musicians in Ukraine and has a PhD degree in theoretical physics.

Vakarchuk is the son of Ivan Vakarchuk, a professor of physics at Lviv University and a former Ukrainian Minister of Education and Science.