Sir James David Wolfensohn KBE, AO (1 December 1933 – 25 November 2020) was an Australian-American lawyer, investment banker, and economist who served as the ninth president of the World Bank Group (1995–2005). During his tenure at the World Bank, he is credited with the focus on poverty alleviation and a rethink on development financing, earning him recognition as a banker to the world's poor. In his other roles, he is credited with actions that brought Chrysler Corporation back from the brink of bankruptcy, and also improving the finances of major United States cultural institutions, including Carnegie Hall and the Kennedy Center. He served two terms as president of the World Bank on the nomination of U.S. president Bill Clinton, and thereafter held various positions with charitable organizations and policy think-tanks including the Brookings Institution.

He was born in Sydney, Australia, and was a graduate of the University of Sydney and Harvard Business School; he was also an Olympic fencer. He worked for various companies in Britain and the United States before forming his own investment firm. Wolfensohn became an American citizen in 1980 and renounced his Australian citizenship, although he eventually regained it in 2010.

Wolfensohn was born on 1 December 1933 in Sydney, New South Wales, Australia. His father Hyman, known as Bill, was born in London to Austrian-Jewish immigrants, while his mother Dora was born in Belgium to Polish parents. His father was a "highly intelligent but failed businessman" who had previously worked for the Rothschild banking family. Wolfensohn's parents arrived in Australia in 1928. He was named after James Armand de Rothschild, his father's former employer, whose birthday he shared. His mother sang with Australian radio and gave him piano lessons, instilling in him a love of the symphony. In high school, he was noted to have taken part in operas, including playing female roles in Gilbert and Sullivan operettas.

Wolfensohn grew up in a two-bedroom flat in Edgecliff. His father struggled financially, and in his autobiography, A Global Life, Wolfensohn described how monetary insecurity was a fact of life from childhood and explained that he was always looking for a cushion to protect himself from it. Wolfensohn attended Woollahra Public School, and then Sydney Boys High School. He entered the University of Sydney at the age of 16, graduating Bachelor of Arts (BA) and Bachelor of Laws (LLB). In 1959 he earned a Master of Business Administration (MBA) from Harvard Business School. In his 2010 memoirs he revealed that he failed several university classes, including English, and was a "late developer".

Wolfensohn was a member of the Australian fencing team at the 1956 Summer Olympics in Melbourne, participating in the Men's Team Épée and an officer in the Royal Australian Air Force.

Before attending Harvard, Wolfensohn was a lawyer in the Australian law firm of Allen, Allen & Hemsley in Sydney (now Allens). Upon graduating from Harvard Business School, Wolfensohn worked briefly for Swiss cement giant Holderbank (now Holcim). He also worked for an air-conditioner company requiring him to travel across India, Nigeria, Greece, Mexico, Latin America, and other developing countries. He wrote in his memoir about the poverty and inequity, "The inequity was so striking that I could hardly absorb what was in front of me. I had known what to expect intellectually, but, the reality was a shock. It left an indelible mark that would influence my later life."

He then returned to Australia, where he worked for various banking institutions, including Darling & Co. In the late 1960s, he became a director of Darling's major shareholder J. Henry Schroder & Co, a London-based investment bank. He was a senior executive in the London office before becoming managing director of the bank's New York City office from 1970 to 1976. He later became a senior executive at Salomon Brothers. In 1979, together with Chrysler Corporation's then chief executive officer Lee Iacocca and then President of the New York Fed Paul A. Volcker, who later became Chairman of the Board of Governors of the Federal Reserve System, Wolfensohn helped orchestrate the rescue of Chrysler from the verge of bankruptcy. In what has been described as the largest corporate bailout at that time, in addition to his banking skills he is noted to have played a role in smoothening a cultural rift between Lee Iacocca and Japanese Bankers, who went on to invest more than $600 million in the company.

In 1980, he became a naturalized citizen of the United States, after it was rumored that he was a candidate to succeed Robert McNamara as president of the World Bank. He renounced his Australian citizenship at this time. He next established his own investment firm, James D. Wolfensohn, Inc., along with partners including Paul Volcker. Upon accepting his nomination to serve as president of the World Bank in 1995, Wolfensohn divested of his ownership interest in James D. Wolfensohn, Inc. The firm was later bought by Bankers Trust. The firm had a diverse client which included Ralph Lauren Corporation and Mercedes-Benz.