Rear Admiral Harley Dean Nygren (December 12, 1924 – November 17, 2019) was an American military officer who served in the United States Coast and Geodetic Survey Corps, its successor, the Environmental Science Services Administration Corps (ESSA Corps), and the ESSA Corps's successor, the National Oceanic and Atmospheric Administration Commissioned Officer Corps (NOAA Corps). He served as the first Director of the NOAA Corps.