"We have at this moment, no reason whatsoever to believe that the Olympic Games in Tokyo will not open on the 23rd of July in the Olympic stadium in Tokyo," Bach said in an interview with Japan's Kyodo News.
"This is why there is no plan B and this is why we are fully committed to make these Games safe and successful," he said.
His comment comes amid growing doubts over the holding of the Games in Tokyo.
The Japanese capital and 10 other prefectures have been under a state of emergency as Japan has failed to rein in a third wave of the coronavirus.