The immature stages (eggs, 1-5 instar larvae and pupae) of 4 genera and 7 species of the tribe Troidini (Lepidoptera: Papilionidae: Papilioninae) in Taiwan are described and color images are provided. The species include: Troides aeacus formosanus (Rothschild, 1899)=Troides aeacus kaguya Nakahara & Esaki, 1930, Troides magellanus Felder & Felder, 1862=Troides magellanus sonani Matsumura, 1932, Atrophaneura horishana (Matsumura, 1910), Byasa polyeuctes termessus (Fruhstorfer, 1908), Byasa impediens febanus (Fruhstorfer, 1908), Byasa alcinous mansonensis (Fruhstorfer, 1901) and Pachliopta aristolochiae interpositus (Fruhstorfer, 1901). Keys to the eggs, first-instar larvae, fifth-instar larvae and pupae of Taiwanese Troidini are provided.