Anton Coșa was born on November 23, 1961, in a family of farmers,[2] in the village of Valea Mare in the Faraoani commune, then located in the Bacău County. His family also gave two other priest brothers, Fr. Eduard Coșa from Bacău and Fr. Francisc Coșa from Bucharest. He attended primary school in his native village, and then high school in Hemeiuș commune in Bacău County.