百济（前18年－660年）（又称南扶余）是古代朝鲜半岛西南部的国家。532年新罗兼并伽倻后，在朝鲜半岛上百济与高句丽，新罗三足鼎立，这段时间被历史学家称为朝鲜三国时代。

据《三国史记》记载，百济传说是高句丽创始者朱蒙的第三个儿子温祚王于公元前18年在汉江南岸（今韩国河南市）创建。《隋书/卷81》也载“百济之先，出自高丽国”。百济的鼎盛时期疆土涵括西朝鲜（除了平安北道和平安南道）的绝大部分。最北曾到平壤。百济曾是海上的强国，通过海路与古代中国和日本各政权进行政治和贸易往来。据《隋书/卷81》记载百济人口混杂有新罗、高丽、倭等，也有中国人。

Baekje or Paekche (Hangul: 백제;hanja: 百济;RR: Pekje, Korean pronunciation: [pɛktɕ͈e]) (18 BC – 660 AD) was a kingdom located in southwest Korea. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla.

Baekje was founded by Onjo, the third son of Goguryeo's founder Jumong and So Seo-no, at Wiryeseong (present-day southern Seoul). Baekje, like Goguryeo, claimed to succeed Buyeo, a state established in present-day Manchuria around the time of Gojoseon's fall.