Nguyễn Thị Ngọc Diễm (chữ Hán: 阮氏玉琰, 1721–1784), posthumous name Từ Trạch (慈澤), was a consort of lord Trịnh Doanh.
Lady Nguyễn Thị Ngọc Diễm was born in 1721 at Linh Đường village, Linh Đàm commune, Thanh Trì district, Southern of Phụng Thiên prefect.
She was commended to Trịnh clan's palace by her father who was Duke Nguyễn Văn Luân (阮文倫, 1686–1739).
She became a concubine of prince Trịnh Doanh and was granted the title Hoa Dung (花容).
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