Robert "Bob" Ansett (born 8 August 1933 in Melbourne) is an Australian entrepreneur, actor, author, motivational speaker, and former chairman of the North Melbourne Football Club.

Ansett is the son of Reg Ansett and Grace Ansett. Reg Ansett was the owner of various businesses, including Ansett Transport Industries, Diners Club Australia, Ansett Australia and, much later, Avis Australia.

Bob Ansett's parents divorced in 1941, when Bob was seven or eight years old. He, his mother Grace, and brother John, soon moved to the United States. Ansett grew up in the US state of Alaska, and has claimed that, during the 20 years he lived in the States, he saw his father no more than five times, their relationship seemingly severed by the distance between their places of residence. Ansett has said that he never visited his father's home in Mount Eliza, Victoria, or met his three stepsisters.

In 1955, he was drafted by the United States Army and served in Japan. In North America, Ansett attended the University of Utah with an American football scholarship.

By 1965, Ansett was having financial difficulties in the United States. At the same time, the car rental industry in Australia was booming. Both federal and state governments in Australia took a protective stance regarding publicly owned companies, by restricting competition that might affect them.

The lion's share of the Australian car rental industry's business belonged to Avis Australia, which later belonged to Bob Ansett's father, Reg. Avis Australia had government contacts, as well as contracts with Qantas and Reg Ansett's airline, Ansett Australia, which led to Avis company being the sole licensed car rental operator at Australia's 56 major airports. With that in mind, Bob Ansett decided to return to Australia. He was in need of a job and asked his father for one, but was denied. Ansett then raised some capital and became licensed to use the name of Budget Rent a Car, the American car rental company, in Australia. That meant, in essence, when Reg Ansett bought Avis Australia in 1977, father and son became direct competitors. Bob Ansett opened the first Budget Australian location in Melbourne in 1965.

By the early 1980s, Ansett was known to Australians as Budget Australia's owner, appearing on commercials promoting the brand, and was known to occasionally show up himself at Budget locations to attend to the customers. Under Ansett's leadership, Budget had overcome, among others, the Avis operation of his father, Reg Ansett, and become the leading car rental company in Australia.

However, financial troubles loomed for the company, and several financial advisors cast doubt on Ansett's capabilities as a company president. In addition to that, Ansett did not maximise Budget's profits when the company had become the leading car rental company in Australia, because he did not consider profit a priority. There was also a financial dispute between Budget and Citibank, and the Ford Motor Company decided to stop shipping cars to Budget, which compounded the company's financial crisis.