Nguyễn Văn Diệp, stage name Duy Khánh (born 1 June 1936 in Triệu Phước Village, Triệu Phong District, Quang Tri Province, Việt Nam – died 12 February 2003, Fountain Valley, CA, USA) was a Vietnamese singer-songwriter.

In 1952, Duy Khánh won the first prize in a singing contest on a French radio station in Huế with the song Trăng Thanh Bình (Peaceful Moon).

During this period, his name was associated with folk songs and "new folk songs" composed by Phạm Duy: Vợ chồng quê, Ngày trở về, Nhớ người thương binh, Tình nghèo, Quê nghèo, Về miền Trung ...

In 1965, he and female singer Thái Thanh recorded Pham Duy's epic poem Con đường cái quan.

He then founded the band Quê Hương, with members including musicians Châu Kỳ, Nhật Ngân, Ngọc Minh, Nhã Phương, Bảo Yến, and others.