A summer study of the phytoplankton in Lake Drummond is discussed. The lake is located in the center of the Dismal Swamp region of southeastern Virginia. There was little species diversity of the phytoplankton which was composed mainly of diatoms, desmids, and phytoflagellates. The dominant species were Asterionella formosa, Melosira Herzogii, Closteriam gracile, and Staurastrum paradoxum.