An Armenian khachkar has been unveiled at Sydney's iconic St. Mary's Cathedral by Catholic Archbishop of Sydney, Anthony Fisher and NSW Premier Gladys Berejiklian.

The khachkar was donated by Stepan Kerkyasharian and Hilda Kerkyasharian, on behalf of the Armenian-Australian community.

The Khachkar is in gratitude for the Sydney Catholic Diocese's honouring of the Armenian Genocide with a Holy Mass in 2015.