Lazare Nicolas Marguerite Carnot adalah putra Claude Carnot, pengacara dan notaris, dan keturunan keluarga borjuis Calvinisme yang anggotanya menjalankan profesi pedagang kemudian notaris dan hakim.[1][2] Suami Jacqueline Sophie Dupont, dari Maninghem (Pas-de-Calais), mereka memiliki dua putra: Sadi Carnot, fisikawan, salah satu bapaktermodinamika dan mesin kalor, dan Hippolyte Carnot, politikus, dirinya ayahanda Sadi Carnot, Presiden Republik akhir abad ke-19. Kakanda Lazare adalah Joseph Carnot, seorang ahli hukum Prancis.
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Carnot, Lazare Nicolas Marguerite. (2016). In P. Lagasse, & Columbia University, The Columbia encyclopedia (6th ed.). New York, NY: Columbia University Press.
Carnot, Lazare Nicolas Marguerite. (2011). In L. Rodger, & J. Bakewell, Chambers Biographical Dictionary (9th ed.). London, UK: Chambers Harrap.
Great Engineers and Pioneers in Technology Vol1 Ed Roland Turner and Steven Goulden St Martins Press Inc NY 1981