Antonella Kerr, Marchioness of Lothian OBE DSG (born Antonella Reuss Newland; 8 September 1922 – 6 January 2007), also known as Tony Lothian, was a British aristocrat, journalist and writer.
Lady Lothian was the founding president of the annual Women of the Year Lunches at the Savoy Hotel in 1955, and the mother of Conservative parliamentarian and Shadow Cabinet minister Michael Ancram (now Marquess of Lothian).
Antonella Reuss Newland was born in Rome, the only child of Major-General Sir Foster Reuss Newland KCMG CB (1862–1943) and his wife, Donna Nennella Salazar y .
Her parents married in 1918, but divorced in 1928 after her mother, the daughter of an Italian army lieutenant-general, Conte Michele Salazar (descendant of a Spanish nobleman from the times of the Spanish presence in Italy), left her 66-year-old father for a 27-year-old army officer, later Brigadier William Carr CVO DSO.
Newland married a distant relative, Peter Kerr, 12th Marquess of Lothian, at the Brompton Oratory on 30 April 1943; he was then serving as a lieutenant in the Scots Guards. The couple spent most of their married life at Monteviot House and its surrounding 18,000-acre (73 km2) estate near Jedburgh in the Scottish Borders. The Kerrs also owned Melbourne Hall in Derbyshire but they later retired to Ferniehirst Castle in Roxburghshire after dividing the other estates between their sons.