The Silla–Goguryeo and Paekche–Kaya–Wa War (Korean: 나여–제야왜 전쟁; Hanja: 羅麗・濟倻倭 戰爭; RR: Nayeo–Jeyawae Jeonjaeng; MR: Nayŏ–Cheyawae Chŏnjaëng) was a series of conflicts that spanned for 40 years from the mid 4th century to the early 5th century between the Silla–Goguryeo alliance and the Paekche–Kaya–Wa alliance according to the Samguk sagi, Samguk yusa, Nihon Shoki, and inscriptions found in the Gwanggaeto Stele.
It was the first and only time where all four nations of Korea (Goguryeo–Silla–Paekche–Kaya) were involved in a single war, and Wa (Japan)'s first international conflict prior to the introduction of the Yamato Kingship and the following Battle of Baekgang that came after.
