Jonas Gahr Støre (Norwegian: [ˈjùːnɑs gɑː‿ˈʂtø̂ːrə]; born 25 August 1960) is a Norwegian politician who has served as the prime minister of Norway since 2021. He has been leader of the Labour Party since 2014. He served under prime minister Jens Stoltenberg as minister of foreign affairs from 2005 to 2012 and as minister of health and care services from 2012 to 2013. Støre has been a member of the Storting for Oslo since 2009.

Støre was born in Oslo, grew up in West End Oslo and underwent naval officer training at the Royal Norwegian Naval Academy. He studied political science at Sciences Po in Paris from 1981 to 1985 and international relations at the London School of Economics. As a student in Paris, he was active in the efforts to support the Jewish refuseniks in the Soviet Union.

Støre was a career special adviser and director-general in the Prime Minister's Office from 1989 to 1997, serving under prime ministers Jan Syse, Gro Harlem Brundtland, and Thorbjørn Jagland. He became known as a protégé of Brundtland in the 1990s, and her mentorship inspired him to become a member of the Labour Party in 1995. In 1998, he followed Brundtland to the World Health Organization, where he became her chief of staff. Støre was state secretary and chief of staff in the Prime Minister's Office in the first government of Jens Stoltenberg; the government was inspired by the British New Labour project. He later served as secretary-general of the Norwegian Red Cross from 2003 to 2005. Like his political mentors Brundtland and Stoltenberg, Støre is mostly associated with the business-friendly right-wing of the Labour Party. He became a household name for Norwegians during his tenure as foreign minister, when he was voted the most popular member of the cabinet several times.

Despite the Labour Party receiving 1% fewer votes and losing a seat, the centre-left won a majority in the 2021 Norwegian parliamentary election. As the leader of the largest party, Støre was the clear favourite for the role of prime minister. Two days after the resignation of Erna Solberg and her government on 12 October 2021, Støre was appointed as prime minister by King Harald V, leading a minority government with the Centre Party. In early 2025, the Centre Party left the coalition. Støre led the Labour Party to victory in the 2025 parliamentary election and has indicated his intentions of leading another sole-Labour minority government.

Born in Oslo, Støre is the son of the wealthy ship broker Ulf Jonas Støre (1925–2017) and librarian Unni Gahr (1930–2022). He grew up in the Ris neighbourhood in West End Oslo. Støre is a multi-millionaire, with a fortune of around NOK 60,000,000 (approx. US$7,100,000 in 2016). He owns a large part of the family company Femstø. Most of the family fortune comes from the 1977 sale of Norwegian company Jøtul, which was run by his maternal grandfather Johannes Gahr. Støre's paternal grandfather was prominent business executive Jonas Henry Støre, the CEO and chairman of explosives manufacturer Norsk Sprængstofindustri. Støre's great-grandfather Paul Edvart Støre was a Conservative Party mayor and deputy member of the Norwegian parliament from Levanger, and the family were affluent farmers in Trøndelag in the 19th century.

Støre married Marit Slagsvold, a sociologist and minister in the state Church of Norway in 1988. They have three sons, who attended Oslo Waldorf School. Støre is a professed Christian and a member of the state church.

Støre attended Berg School in Oslo, then underwent naval officer training at the Royal Norwegian Naval Academy. He later studied political science for five years at Sciences Po in Paris. He started studying for a PhD at The London School of Economics, but dropped out after a few weeks.

In 1986, Støre was briefly a teaching fellow in the Harvard Negotiation Project at Harvard Law School. From 1986 to 1989 he was a researcher at the Norwegian School of Management, working on the Scenarier 2000 project with sociologist Andreas Hompland and economist Petter Nore.