The woman, 39, and her husband were attacked while camping in woodland in central Madhya Pradesh state.
The men, aged between 22 and 30, were all from a village close to the scene of the rape.
The attack came months after a 23-year-old Indian woman died following a gang rape on a bus in Delhi, sparking protests across the country.
Weeks before the Swiss tourist was raped, changes to the laws were proposed signalling stricter punishments for rapists, including the death penalty.
“All the accused have been convicted and we are satisfied with the judgement,” prosecutor Rajendra Tiwari was quoted as saying on Saturday.
The couple had been on a long cycle tour of the area, as they headed to the Taj Mahal in Agra in Uttar Pradesh, when they were assaulted and robbed in a dense area of forest in the Datia district on 15 March.