Katharine Macmillan, Viscountess Macmillan of Ovenden

The Honourable Viscountess Macmillan of Ovenden DBE
Personal details
Born	Katharine Margaret Alice Ormsby-Gore (1921-01-04)4 January 1921
Died	22 January 2017(2017-01-22) (aged 96)
Spouse	Maurice Macmillan, Viscount Macmillan of Ovenden ​ ​ (m. 1942; died 1984)​
Children	Alexander Macmillan, 2nd Earl of Stockton Joshua Macmillan Adam Macmillan Rachel Macmillan David Macmillan
Parents	William Ormsby-Gore, 4th Baron Harlech (father) Lady Beatrice Gascoyne-Cecil (mother)

Katharine Margaret Alice Macmillan, Viscountess Macmillan of Ovenden DBE (née Ormsby-Gore; 4 January 1921 – 22 January 2017), was the daughter of the 4th Baron Harlech, granddaughter of the 4th Marquess of Salisbury, great-granddaughter of the 10th Marquess of Huntly and daughter-in-law of Prime Minister Harold Macmillan, 1st Earl of Stockton.

On 22 August 1942, she married Conservative politician Maurice Macmillan, making her the daughter-in-law of fellow Conservative politician Harold Macmillan, who would serve as prime minister from 1957 to 1963.

They had five children together:

• 1) Alexander Daniel Alan Macmillan, 2nd Earl of Stockton (born 1943)
• 2) Joshua Edward Andrew Macmillan (1945–1965)
• 3) Adam Julian Robert Macmillan (1948–2016)
• 4) Rachel Mary Georgia Macmillan (1955–1987)
• 5) David Maurice Benjamin Macmillan (born 1957)

She was Vice-Chairman of the Conservative Party in 1968 and was created a Dame Commander of the Order of the British Empire (DBE) in 1974. She became Viscountess Macmillan of Ovenden in February 1984 when her father-in-law, former British prime minister Harold Macmillan, accepted a peerage and was created Earl of Stockton. Her husband died the following month, so never inherited the earldom from his father.

She died on 22 January 2017.