Timofiy Boychuk (Romanivka, 1896 – Kyiv, 1922) was a Ukrainian monumental painter, the younger brother and pupil of Mykhailo Boychuk and a figure associated with the Boychukist movement. His short career unfolded in the years following the 1917 Revolution.
After helping his brother restore church paintings in Lemeshi, he settled in Kyiv and studied at the Ukrainian State Academy of Arts, where he worked in the monumental workshop. He became known for portraits and political posters.
His best-remembered works are peasant scenes such as In the Pasture and Planting Potatoes, painted in tempera on wooden boards between 1919 and 1921. Their composition draws on Proto-Renaissance and Byzantine painting, as well as icons and Ukrainian folk art. He also illustrated children's books.
In 1919 he took part in painting buildings of the Lutsk barracks in Kyiv, but those works were destroyed in 1922. He died suddenly that year, probably of tuberculosis, at about twenty-five.
His legacy is tied to his brother's school and to pupils such as Mikola Kasperovich. Some of his works are kept at the National Art Museum of Ukraine.