Katherine MacGregor (born Dorlee Deane McGregor; January 12, 1925 – November 13, 2018) was an American actress who portrayed Harriet Oleson in Little House on the Prairie.

[5][6][7][8][9][10] Beginning in the 1950s, as Scottie MacGregor, she worked in theatre on and off Broadway in New York City and other locations in plays such as The Seven Year Itch and Handful of Fire,[3][4] and won such uncredited parts as "a longshoreman's mother" (On the Waterfront); "Alice Thorn" (The Traveling Executioner), and "Miss Boswell" (The Student Nurses).

She appeared in numerous episodes of various television series: Love of Life (1956), The Secret Storm, The Nurses,[11] The Play of the Week (1959), East Side/West Side (1963), Mannix (1970–71), Emergency!

Her first screen credit as Katherine MacGregor, and her best-known role, was from 1974 to 1983 in NBC's Little House on the Prairie as Harriet Oleson, the general store owner's wife and a comedic part.

In 1979, due to the popularity of Little House in Spain, MacGregor was invited to Madrid, and appeared on RTVE's 625 Lineas and Ding Dong La Cocina programs.