Lowell Fitz Randolph (7 October 1894 – 28 May 1980) was an American scientist, in the field of genetics, botany and horticulture. He was a Cornell University graduate who became Professor of Botany and was also employed as an associate cytologist for the United States Department of Agriculture. He was also an avid iris collector and wrote a book on the Iris genus. He carried out important research into plant chromosomes of iris, orchid genus and corn plants (such as maize). He was sometimes known as "Fitz" by his many friends and associates.