Sayaka (?) (沙也可, also written as 沙也加) (1571? - 1643?) (Korean name is Kim Chung-seon) was a person who allegedly went to Korea under the command of Kiyomasa KATO during the Bunroku-Keicho War (Jinshin waran in Korean), but surrendered to join the Korean army and fought off the Japanese army.
沙也可（さやか？・沙也加、1571年?-1643年?）朝鮮名金忠善(김충선)は、文禄・慶長の役（朝鮮においては壬辰倭乱）の際、加藤清正の配下として朝鮮に渡ったが、投降して朝鮮軍に加わり日本軍を撃退したとされる人物。