Ostap Mykhaylovych Semerak is a Ukrainian politician and former People's Deputy of Ukraine's parliament, the Verkhovna Rada, and former Minister of Ecology in the Groysman Government.

The Groysman government was formed on 14 April 2016, led by Volodymyr Groysman. It was the third Ukrainian cabinet formed since the 2014 Ukrainian revolution, following on from the first and second Yatsenyuk governments.