Adolphus Ypey or Adolphus Ypeus or Adolf Ypey (4 June 1749, Franeker - 27 February 1822, Leiden), was a Dutch botanist and Doctor of Philosophy and Medicine who graduated at the University of Franeker and stayed on to lecture in botany. He later lectured in Medicine at the University of Leyden. He was the son of professor .His graduate dissertation was entitled Dissertatio philosophica inauguralis de igne with academic advisor Jan Hendrik van Swinden.