Kokugaku (Kyūjitai: 國學/Shinjitai: 国学; lit. National study) was a National revival, or, school of Japanese philology and philosophy originating during the Tokugawa period. Kokugaku scholars worked to refocus Japanese scholarship away from the then-dominant study of Chinese, Confucian, and Buddhist texts in favor of research into the early Japanese classics.

What later became known as the kokugaku tradition began in the 17th and 18th centuries as kogaku ("ancient studies"), wagaku ("Japanese studies") or inishie manabi, a term favoured by Motoori Norinaga and his school. Drawing heavily from Shinto and Japan's ancient literature, the school looked back to a perceived golden age of Japanese culture and society. They drew upon ancient Japanese poetry, predating the rise of the feudal orders (in the mid 12th century) and other cultural achievements to show the 'emotion' of Japan. One famous 'emotion' appealed to by the kokugakusha is 'mono no aware'.

The word 'Kokugaku', coined to distinguish this school from kangaku (Chinese studies), was popularized by Hirata Atsutane in the 19th century. It has been translated as 'Native Studies' and represented a response to Sinocentric Neo-Confucian theories. Kokugaku scholars criticized the repressive moralizing of Confucian thinkers, and tried to re-establish Japanese culture before the influx of foreign modes of thought and behaviour.