Margaretha Maria Antonetta 'Margriet' de Moor (née Neefjes; born 1941) is a Dutch pianist and writer of novels and essays.

Margaretha Maria Antonetta Neefjes, born in Noordwijk, 21 November 1941, married sculptor Heppe de Moor (1938 - 1992).

After junior high and the Hogere Burgerschool she attended the Royal Conservatory of The Hague, where she studied piano and singing.

Afterward she studied art history and archeology in Amsterdam and taught piano.

De Moor began writing, and after a failed attempt at a novel, debuted with a story collection, Op de rug gezien; the collection won her a literary award, the Gouden Ezelsoor, and a nomination for the AKO Literatuurprijs.