Nancy Ann Lange Kuczynski (born January 20, 1954) is an American investment and marketing professional and Peruvian resident.

[1][4] During the 2016 Peruvian general election, Lange played an essential role in her husband's campaign as an advisor and organizer.

[1] Lange created "Chambeando por el Perú", which promoted a series of social reforms in remote areas of the country.

One of Lange's first public events as first lady was the march protesting violence against women known as "Ni una menos.

"[1] She has extensively promoted firemen's efforts in Lima, as well other education and health initiatives across the country.