Ostap Mykhaylovych Semerak (Ukrainian: Остап Михайлович Семерак; born 27 June 1972) 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.

In the 2014 Ukrainian parliamentary election Semerak was re-elected into parliament placed 33rd on the electoral list of People's Front.

[4][5][6] He was designated as the First Deputy Chairman of the Committee of the Verkhovna Rada on issues of European integration on 4 December 2014.

[8] In election district 124 located in Chervonohrad he took seventh place with a result of 8.84%.

Father Michael Mikhailovich (1940) – Head of thermodynamics and physics at Lviv State University of Life Safety.