King conducted an estimated 50,000 interviews in his six-decade career, which included 25 years as host of the popular CNN talk show Larry King Live.
He died at Cedars-Sinai Medical Centre in Los Angeles, according to Ora Media, a production company he co-founded.
Earlier this month, he was treated in hospital for Covid-19, US media say.
The talk show host, famous for his braces and rolled-up sleeves, had faced several health problems in recent years, including heart attacks.