Louis-Christophe Zaleski-Zamenhof (born Ludwik Zamenhof; 23 January 1925 – 9 October 2019) was a Polish-born French civil and marine engineer, specializing in the design of structural steel and concrete construction.

Together with some members of his family he survived in the Warsaw Ghetto, where he was one of the individuals aided by the parish priest Marceli Godlewski.

During that time, he worked in a tomato field together with a Pole who happened to speak Esperanto; this person once tried to recruit him to the cause, asking him: Ĉu vi konas Esperanton?

Beginning in Poland after World War II and since the 1960s in France, he has designed precast concrete structures and projects ranging from deep-sea oil rigs, sports complexes, and the Charles de Gaulle Memorial, which dominates the village of Colombey-les-Deux-Églises.

Declaring that mankind is a species created for diversity, he congratulated the Brazilian hosts for the variegatedness of the nation's natural setting and the diversity of its peoples, customs and cultures and favourably compared Brazilians to the "great family circle" of worldwide Esperantism, urging people to not to see cultural differences as a threat but as their good fortune.

Though he had no plans to write an autobiography, Polish journalist Roman Dobrzyński persuaded him to participate in a series of conversations over a ten-year period, which resulted in La Zamenhof-strato ("Zamenhof Street", 2003),[7] a book detailing his life during the Nazi occupation of Poland, including his experiences in the Warsaw Ghetto and the Polish Resistance.

Beyond an account of his own life, the book also relates the philosophy, history and tribulations of the Esperanto movement pioneered by his grandfather, and speculates as to the planned language's future prospects.

The book has now been published in Polish, Esperanto, Lithuanian, Czech, Italian, Japanese, Portuguese, Slovak, French and Korean.