12 June] 1873 – 1 August 1918) was a Ukrainian politician, writer, translator, and academic of the Shevchenko Scientific Society.

After graduating from the Department of History and Philosophy in 1896, he worked as a teacher in women's school, gymnasium.

At that time he was preparing the Ukrainian dictionary, wrote a book about Kotliarevsky's work (1898), and its own poetry collections such as Khutorni Sonety (Farmstead sonnets, 1899) and Steppovi Motyvy (Steppe Motifs, 1900).

After the October Revolution he was elected as the member of the Kiev Civic Executive Committee and the Tsentralna Rada.

Out of his translations were works of Ovid, Friedrich Schiller, Alexander Pushkin, Lord Byron, and others.

Serhiy Yefremov while on the way to Poltava wrote in his diary: "I just found out from Kost Ivanovych [Tovkach] scary details about the murder of Steshenko.