The article is devoted to those cases when Leo Tolstoy wrote about one of the main representatives of French “social Christianity” - HuguesFélicité Robert de Lamennais - and when Tolstoy mentioned him. Lamennais's thought as Tolstoy formulated it reminds very much of Gogol's books of journalism published in the last years of his life. This phenomenon is determined, on the one hand, by Gogol's affinity to Lamennais and to “social Christianity”, and on the other hand, by the fact that Tolstoу perceived this Russian writer as a phenomenon similar to that French thinker. Tolstoy's writing about Lamennais have taken place mostly in 18801900s. Most often they serve as a proof of his own convictions on the Church's going away from the true religion, on the predominance of “prejudice of violence” in the world, on the people living the true life and on the inevitable universal “brotherhood”.