The incident happened at about 5 p.m. Tuesday in the waters of the quarry. The spot, about 30 kilometres northwest of Ottawa, is a popular spot for swimmers, scuba divers, bungee jumpers and snorkelers.
The man, 35, was swimming at the quarry with his eight-year-old daughter and a friend.
A vacationing off-duty Montreal police officer watched the man jump off a cliff into the water, a distance estimated to be about 23 metres.
The waters of the quarry are about 40 metres deep, and the officer — who was wearing a snorkeling mask — was unable to rescue the man.
Police have not yet confirmed whether the body pulled from the quarry Wednesday morning is the same man who jumped off the cliff.