Kazimierz Ignacy Nitsch (1 February, 1874 – 26 September, 1958) was a Polish Slavic linguist, historian of the Polish language and dialectologist. He was one of the co-founders of the Society of Polish Language Enthusiasts and in the years 1919–1958 he edited the organ of the society "Polish Language". In 1901, he began dialectological research in Kashubia. President of the Polish Academy of Arts and Sciences. Son of Maximilian Nitsch, a Polish architect. He was educated at St. Anne's Gymnasium. In 1903, he obtained a scholarship from the Academy of Arts and Sciences and went to study in Pragu