Harold R. Popp (June 17, 1903 – February 22, 1969) was an American pharmacist, businessman, and politician.
He received his bachelor's degree in pharmacy from University of Wisconsin–Madison.
Popp served in the Minnesota Senate from 1959 until death in 1969.
Popp and his wife were killed in an automobile accident when their automobile skidded on some ice on Highway 7 east of Highway 261 in McLeod County, Minnesota.
Popp died at Methodist Hospital in St. Louis Park, Minnesota.