Kerry was out riding the day after meeting with his Iranian counterpart Mohammad Javad Zarif in Geneva to try to overcome obstacles in negotiations on curbing Tehran's nuclear programme.
Kerry was transported via medical helicopter to a hospital in Geneva, where he is being examined, spokesman John Kirby said.
"Secretary Kerry is stable and likely suffered a leg injury. He did not lose consciousness," Kirby said, adding that paramedics and a doctor were on the scene with Kerry's motorcade at the time of the accident.
The 71-year-old secretary of state is an avid cyclist and often takes his own bike on official trips abroad.
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