Father Pierre Le Beller of the Saint Jacques Missionary Center in western France says fellow missionaries in Haiti told him they found Miot's body in the ruins of the archdiocese office.
Miot was 63. Le Beller spoke to The Associated Press by phone from the Brittany town of Landivisiau.
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Complete Coverage: Devastation in Haiti
The order of missionary priests was officially founded in 1951 by the bishop of Gonaives, Haiti. While headquartered in France, it retains a strong presence in Haiti and traces its unofficial missionary activity to 1860.
Haitians piled bodies along the devastated streets of their capital Wednesday after a powerful earthquake crushed thousands of structures, from schools and shacks to the National Palace and the U.N. peacekeeping headquarters. Untold numbers were still trapped.
It seemed clear that the death toll from Tuesday afternoon's magnitude-7.0 quake would run into the thousands. France's foreign minister said the .
International Red Cross spokesman Paul Conneally said a third of Haiti's 9 million people may need emergency aid and that it would take a day or two for a clear picture of the damage to emerge. The United Nations said the capital's main airport was "fully operational" and that relief flights would begin Wednesday.
Aftershocks continued to rattle the capital of 2 million people as women covered in dust clawed out of debris, wailing. Stunned people wandered the streets holding hands. Thousands gathered in public squares to sing hymns.