摩揭陀俗语(Magadhi Prakrit (Ardhamāgadhī))是古印度的一种语言，属普拉克里特诸语言之一。在梵语和巴利语相继没落之后，摩揭陀俗语成为古印度的书面语言之一。

摩揭陀俗语使用范围为印度次大陆的东部，包括今日印度东部、孟加拉国和尼泊尔。佛教创始人释迦牟尼和耆那教创始人笩駄摩那都是摩揭陀俗语的用户。在印度列国时代，该语言是摩揭陀的宫廷语言，后来也是孔雀王朝的宫廷语言。阿育王诏书便是用该语言写成。

摩揭陀俗语后来发展成为印度-雅利安语支的东部诸语，包括阿萨姆语、孟加拉语、奥里亚语和比哈尔诸语（包括博杰普尔语、迈蒂利语、摩揭陀语等语言）。

Magadhi Prakrit (Ardhamāgadhī) is of one of the three Dramatic Prakrits, the written languages of Ancient India following the decline of Pali and Sanskrit. Magadhi Prakrit was spoken in the eastern Indian subcontinent, in a region spanning what is now eastern India, Bangladesh, and Nepal. It is believed to be the language spoken by the important religious figures Gautama Buddha and Mahavira and was also the language of the courts of the Magadha mahajanapada and the Maurya Empire; the edicts of Ashoka were composed in it.