The fire broke out in a pump room aboard the SeaRose floating platform at the White Rose field after 5 p.m., about 350 kilometres east of St. John's.
Husky Energy said the vessel's fire response teams put it out, and that "the incident was contained to the firewater pump room."
The SeaRose is currently not in production. The vessel had recently returned to White Rose, the third oil field to go into production on the Grand Banks, following maintenance work in Northern Ireland.
Husky said the company is investigating how the fire started.
It's the second fire in the last few months on the FPSO. In May, a small fire broke out in a generator. No one was injured in that incident, either.