Princess Astrid, Mrs. Ferner (Astrid Maud Ingeborg; born 12 February 1932) is the second daughter of King Olav V and his wife, Princess Märtha of Sweden. She is the older sister of King Harald V of Norway and younger sister of the late Princess Ragnhild. Her 1961 marriage to divorced commoner John Martin Ferner caused a scandal, reported as "the most controversial royal wedding since the Abdication".

Astrid was born on 12 February 1932 at Villa Solbakken to the future King Olav V and Crown Princess Märtha. She was baptized in the Palace Chapel on 31 March 1932. Her godparents were her paternal grandparents, King Haakon VII and Queen Maud of Norway; her maternal grandparents, Prince Carl and Princess Ingeborg of Sweden; her maternal aunt, Princess Astrid, Duchess of Brabant; Elizabeth, Duchess of York; her grandaunt, Princess Thyra of Denmark; her granduncle, Prince Eugen of Sweden; and Prince George of the United Kingdom. Astrid was named after her maternal aunt, paternal grandmother, and maternal grandmother. Astrid is a great-granddaughter of King Edward VII of the United Kingdom and thus a second cousin to Queen Elizabeth II. At the time of her birth, she was 18th in the line of succession to the British throne.

Astrid grew up on the royal estate of Skaugum in Asker and was privately educated during her childhood. During World War II, she joined her family fleeing the Nazis and spent the war with her mother, brother and sister in exile in Washington, DC. Following the royal family's return to Norway she attended Nissen's Girls' School and graduated with the examen artium university entrance exam in 1950. She then studied economics and political history for two years at Lady Margaret Hall, Oxford University.

Her confirmation took place on 9 May 1948 in the Palace Chapel. Astrid studied ceramics with Halvor Sandøs and had her own pottery studio in Skaugum. She was an accomplished ski-er and yachtswoman.

Astrid's mother died in 1954. From which time until her brother's marriage in August 1968 she was the senior lady of the court and acted as first lady of Norway, working side-by-side with her father on all representation duties, including state visits. In September 1954, she took part in the ship tour organized by Queen Frederica and her husband King Paul of Greece, which became known as the “Cruise of the Kings”, attended by over 100 royals from across Europe.

In January 1961 Astrid married commoner John Martin Ferner in Oslo. They met when she hired him to sail her yacht in a race. The marriage was met by "bitter opposition" from the Norwegian Church as Ferner had been previously married. After the marriage, she became known as Princess Astrid, Mrs Ferner and no longer got the annual endowment of 50,000 Norwegian crowns that she previously received as First Lady. They raised their family in Vinderen. She now lives in Nordmarka, Oslo.

In 2002, the government granted Astrid an honorary pension in recognition of her efforts on behalf of Norway, both during and following her years as first lady. In 2005 she took part in ceremonies marking the 60th anniversary of the end of World War II, including the unveiling of a plaque marking the Norwegian monarch's exile in London.

In February 2012, Astrid celebrated her 80th birthday with a private dinner at the Royal Palace in Oslo.