She won "for her efforts to promote peace and international law", the Norwegian Nobel Committee said on Friday.
The peace prize is the fifth Nobel awarded this week after literature, chemistry, physics and medicine.
Venezuelan opposition leader Maria Corina Machado won in 2025.
The year 2026 marks the 125th anniversary of the peace prize.
The Norwegian Nobel Committee in Oslo received nominations for 287 candidates for the 2026 prize, and just more than a quarter of them are organisations.
The prize money is 12 million Swedish kronor ($A1.7 million), whether for an individual, small group of laureates or organisation.
The year 2026 marks the 125th anniversary of the peace prize, which has gone to 112 individuals and 28 separate institutions since its inception in 1901.
The Red Cross has won three times and the UN refugee agency twice.
Just 20 of the 112 individual laureates have been women, but eight of those women received the prize in the past 15 years.
Education activist Malala Yousafzai is the youngest laureate; she won at 17 in 2014.
The prize has gone unawarded on 19 occasions, most of them during the world wars.
with Reuters
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