Fyodor Sologub (Russian: Фёдор Сологу́б, born Fyodor Kuzmich Teternikov, Russian: Фёдор Кузьми́ч Тете́рников, also known as Theodor Sologub) was a Russian Symbolist poet, novelist, translator, playwright and essayist. He was the first writer to introduce the morbid, pessimistic elements characteristic of European fin de siècle literature and philosophy into Russian prose.