Sincerely" (シンシアリー, Shinshiarī) is a compilation album by Japanese singer/songwriter Mari Hamada, released on December 16, 1989 by Invitation.

It is Hamada's first ballad-oriented album, featuring four new songs and three re-recordings of her past hits.

[1][2] Hamada's 1994 international release All My Heart features "Over the Rainbow" and "Open Your Heart" rewritten in English as "With All My Heart" and "Out of My Hands", respectively.

It was also certified Platinum by the RIAJ.

[3][4] All lyrics are written by Mari Hamada, except where indicated^ Shipments figures based on certification alone.