Danny Ongais (born May 21, 1942 in Kahului, Maui Island, Hawaii) is a former racecar driver from the United States.
He is the only native Hawaiian to compete at the Indianapolis 500. A motorcycle, sports car, Formula One, and drag racing competitor, in 1963 and 1964 Ongais won the American Hot Rod Association AA Gas Dragster Championship and in 1965 he added the National Hot Rod Association AA Dragster championship title.
A flamboyant figure on the racing circuit, Danny's nickname was "On-Gas" for his 'balls to the wall' driving style. He was also known as the "Flyin'-Hawaiian".
He was a Formula One driver who participated in six Grands Prix, debuting on October 2, 1977, and recorded a best result of seventh. In 1996 at the age of 54, Ongais agreed to be the substitute driver for Scott Brayton in the Indy 500 who had died in a practice crash shortly before the race. Starting last, Danny finished 7th in what was his final 500.
In 1981 he had a severe accident in the Indy 500, which almost cost his life. Several arm and leg fractures as well as internal injuries were the result. Then in 1985 at the Michigan 500, he spun on the exit of turn two and barrel-rolled down the back straight, during a race which had several crashes throughout its duration.