Gunathilake Bandara Senanayake (14 July 1913 – 16 March 1985) (known as G.B Senanayake) (Sinhala: ජී.බී. සේනානායක) was a prominent Sinhala author who portrayed Sinhala middle-class life in his novels. He is credited with introducing free verse poetry to Sinhala. He became blind later in his life and still managed to write 16 books with help from his sister-in-law Deemathi Senanayake and niece Dayani Senanayake.

The second stage of Sinhala short stories begins with G.B. Senanayake's short stories. Though mainly focused on short stories Senanayake also wrote Novels and Poetry as well. He introduced 'Nisandas' during a time when Sinhala poetry was in need of a different style. G.B. Senanayake was a writer who was very concerned about being grammatically correct in writing.