By 1970, O'Neil had taken up racing on water and land, participating in the
Baja 500 and
Mint 400. She met stuntmen
Hal Needham and Ron Hambleton while racing motorcycles, and lived with Hambleton, giving up racing for a time. In the mid-1970s, she entered stunt work, training with Needham, Hambleton and
Dar Robinson. In 1976, she was one of two stuntwomen, Janet Brady being the other to join Stunts Unlimited, the leading stunt group. As a stuntwoman, she appeared in
The Bionic Woman, ''
Airport '77, The Blues Brothers, Smokey and the Bandit II'' and other television and film productions. In 1978, her stunt career inspired a Kitty O'Neil action figure, made by
Mattel. In filming for a 1979 episode of
Wonder Woman, O'Neil was hired to perform a stunt of high difficulty for
Jeannie Epper,
Lynda Carter's usual stunt double. In the process, she set a women's high-fall record of at the 12-storey Valley Hilton in Sherman Oaks, California. She credited her small size, at 5'-2" and , for allowing her to withstand impact forces. She later broke her record with a fall from a helicopter. In 1977, O'Neil set a women's record for speed on water of , and she held a 1970 women's water skiing record of . ==Land speed record==