Ivan Oleksandrovych Vakarchuk (Ukrainian: Іван Олександрович Вакарчук; 6 March 1947 – 4 April 2020) was a Soviet-Ukrainian physicist, politician and social activist.

Hero of Ukraine (awarded on 5 March 2007), he was father of the leader of the rock band Okean Elzy Svyatoslav Vakarchuk.

From 1970 to 1973 he continued his studies at postgraduate research (aspirantura) of the Lviv section of condensed state statistical theory of the Institute of Theoretical Physics, affiliated with the Ukrainian Academy of Sciences.

[5] Ivan Vakarchuk represented the Lviv school of statistical physics founded by Ihor Yukhnovskyi, member of the National Academy of Sciences of Ukraine.

From 1973 to 1984 Ivan Vakarchuk worked at the Lviv branch of the Institute for Theoretical Physics affiliated with the Ukrainian Academy of Sciences (now is the Institute of Condensed Matter Physics of National Academy of Sciences) as junior research fellow, senior researcher and head of quantum statistics department.

1947) is teacher of physics, assistant professor of Lviv National Stepan Gzhytsky University of Veterinary Medicine and Biotechnology.