Musk was born to a Canadian mother and South African father and raised in Pretoria, South Africa. He briefly attended the University of Pretoria before moving to Canada aged 17 to attend Queen's University. He transferred to the University of Pennsylvania two years later, where he received bachelor's degrees in economics and physics. He moved to California in 1995 to attend Stanford University but decided instead to pursue a business career, co-founding the web software company Zip2 with brother Kimbal.

The startup was acquired by Compaq for $307 million in 1999. Musk co-founded online bank X.com that same year, which merged with Confinity in 2000 to form the company PayPal and was bought by eBay in 2002 for $1.5 billion.In 2002, Musk founded SpaceX, an aerospace manufacturer and space transport services company, of which he is CEO, CTO, and lead designer. In 2004, he joined electric vehicle manufacturer Tesla Motors, Inc. (now Tesla, Inc.) as chairman and product architect, becoming its CEO in 2008. In 2006, he helped create SolarCity, a solar energy services company and current Tesla subsidiary. In 2015, he co-founded OpenAI, a nonprofit research company that promotes friendly artificial intelligence. In 2016, he co-founded Neuralink, a neurotechnology company focused on developing brain–computer interfaces, and founded The Boring Company, a tunnel construction company.

Musk has proposed the Hyperloop, a high-speed vactrain transportation system.Musk has been the subject of criticism due to unorthodox or unscientific stances and highly publicized controversies. In 2018, he was sued for defamation by a diver who advised in the Tham Luang cave rescue; a California jury ruled in favor of Musk. In the same year, he was sued by the US Securities and Exchange Commission (SEC) for falsely tweeting that he had secured funding for a private takeover of Tesla.

He settled with the SEC, temporarily stepping down from his chairmanship and accepting limitations on his Twitter usage. Musk has spread misinformation about the COVID-19 pandemic and has received criticism from experts for his other views on such matters as artificial intelligence and public transport.

Elon Reeve Musk was born on June 28, 1971, in Pretoria, South Africa. His mother is Maye Musk (née Haldeman), a model and dietitian born in Saskatchewan, Canada, but raised in South Africa. His father is Errol Musk, a South African electromechanical engineer, pilot, sailor, consultant, and property developer. Musk has a younger brother, Kimbal (born 1972), and a younger sister, Tosca (born 1974).

His maternal grandfather, Joshua Haldeman, was an American-born Canadian. His paternal grandmother had British and Pennsylvania Dutch ancestry. After his parents divorced in 1980, Musk lived mostly with his father in Pretoria and elsewhere, a choice he made two years after the divorce and subsequently regretted. Musk has become estranged from his father, whom he has described as "a terrible human being... Almost every evil thing you could possibly think of, he has done." He has a half-sister and a half-brother on his father's side. At the age of 10, he developed an interest in computing while using the Commodore VIC-20. He learned computer programming using a manual and, by age 12, sold the code of a BASIC-based video game he created called Blastar to PC and Office Technology magazine for approximately $500. An awkward and introverted child, Musk was bullied throughout his childhood and was once hospitalized after a group of boys threw him down a flight of stairs. He attended Waterkloof House Preparatory School and Bryanston High School before graduating from Pretoria Boys High School.