Nadezhda Yakovlevna Mandelstam (, ; [??????]; 29 December 1980) was a Soviet writer, translator, educator, linguist, and memoirist.

She is the author of two memoirs about her life with her husband Osip Mandelstam and the repressive Stalinist regime they faced: Hope Against Hope (1970) and Hope Abandoned (1974), both first published in the West in English,