He added that the killings were "made possible by twisted racial, ideological or religious aims that darkened the minds of the tormentors even to the point of planning the annihilation of entire peoples."
The remarks were met by a standing ovation.
"One cannot but believe in the triumph of justice when in 100 years... the message of justice is being conveyed to mankind from the heart of the Catholic world," President Sargsyan said.
There was no immediate reaction from Turkey, which last year recalled its envoy to the Vatican after the Pope referred to "genocide".
The envoy was kept away for 10 months.
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