Stanisław Leopold Janikowski (February 17, 1891 – September 23, 1965) was a Polish diplomat and an Etruscologist.
Stanisław Leopold Janikowski was born in Piotrków, southern Poland, son of Leopold and Zofia (née Krajcewicz). He spent most of his married life in Rome, Italy, until returning to Poland in 1965. On September 23, 1965, he died aged 77 in his parents' home in Zielonka, near Warsaw and is buried in Warsaw.
From his school years Stanisław was involved in the underground fighting against the Tsar. His code name in these secret activities was Wampir (English: Vampire). He joined the Revolution with the school strike of 1905 against Russification. He belonged to the Polskie Drużyny Strzeleckie (English: Polish Rifle Squads, a Polish pro-independence paramilitary organization tolerated by the Austrian government in Kraków) and the Sokół (Polish: Polskie Towarzystwo Gimnastyczne "Sokół", English: Polish Gymnastic Society "Falcon"). Poor Health and the outbreak of World War I meant that he was unable to complete his studies at the Jagiellonian University. Since he could not be accepted by the regular army, during the World War, he was active in the secret Wolnej Szkole Wojskowej (English: Free Cadet School) in Warsaw. From 1914 he was a member of the clandestine Central Committee of ‘ZET’ the Association of the Polish Youth (Polish: Związek Młodzieży Polskiej) and from 1915 in the secret Polska Organizacja Wojskowa (POW - English: Polish Military Organization). From 1918, with former members of ZET who also could no longer be considered to be “youth”, he was a committee member of Związku Patriotycznym (English: Patriotic League) and then with the Związek Naprawy Rzeczpospolitej (English: Union for Improvement of the Republic).