T. K. Doraiswamy (21 August 1921 – 17 May 2007), also known by his pen name Nakulan, was an Indian poet, professor of English, novelist, translator and short fiction writer, who wrote both in Tamil and English, and is known for his surrealism and experimentation as well as free verse. He served as Professor of English, Mar Ivanios College, Thiruvananthapuram for four decades.
During his literary career which started in his forties, when he started writing in Ezhuthu, a literary magazine founded by C. S. Chellappa, he wrote a novel and six books of poems in English, and nine novels and five books of poems in Tamil. His English work was mostly published under his real name, while Tamil works often appeared under his pen name. He also wrote briefly under the pen name, S. Nayar(sp?). His symbolic novel Ninaivup Patai Nilakal (1972) is considered a milestone in Tamil literature and established him as an avant garde novelist. His other notable works in Tamil include, Nizhalgal, Naykal, Naveenante Diary Kurippukal, Ezhuthu Kavithaikal, Iruneenda Kavithaikal, Antha Manchal Nira Poonaikutty, and in English, Words to the Wind, 'Non-Being' and 'A Tamil Writer's Journal'.
He received the Asan Memorial Award for Tamil Poetry in 1983.