1912. Unpublished letters from Mr Guizot to the Duchess Decazes, The Weekly Review, Volume VII, July, pp. 145-182.
1925. Letters to Lady Alice Peel, published by Lady Wester Wemyss, La Revue de France, Volume 3, pp. 417-444 and 671-705.
1934. André Gayot, Guizot and Madame Laure de Gasparin, Paris, Grasset.
1954. Edouard Dolléans, Guizot and Pauline de Meulan, Revue des Deux Mondes, pp. 140-147.
1958. Douglas Johnson, Guizot and Lord Aberdeen in 1852, Review of modern and contemporary history, Volume V, January-March, pp. 55-70.
1961. Marguerite Maire, Guizot and his Genevan cousins from unpublished letters, Mélanges Paul-Edouard Martin, Geneva, pp. 581-592.
1963-1964. Letters from François Guizot and the Princess of Lieven (1836-1846), preface by Jean Schlumberger (Female influences in the life of François Guizot), Paris, Mercure de France, 3 volumes.
1964-1965. Unpublished correspondence by François Guizot (with Achille de Daunant), published by Xavier Azéma, Fédération historique du Languedoc méditerranéen et du Roussillon, XXXVIIth and XXXVIIIth congresses, Montpellier, n.d.
1976. Régis Ladous, Guizot and Montalembert under the Second Empire from their unpublished correspondence, Proceedings of the François Guizot symposium, Paris, Société de l'histoire du protestantisme français.
1981. Ten unpublished letters from Guizot to Pastor Louis Rognon, by Claude Michel, Bulletin of the Society for the History of French Protestantism, p. 646-656.
2002. François Guizot, Letters to his daughter Henriette 1836-1874, edited by Laurent Theis, with a biographical essay on Henriette de Witt-Guizot by Catherine Coste, Paris, Perrin.
2006. The Foundation of the entente cordiale. Unpublished letters from Lord Aberdeen and François Guizot 1843-1848, presented by Gabriel de Broglie and notes by Laurent Theis.