Siljik (Korean: 실직) was the name of first an independent kingdom (Siljik-guk) and then a province of Silla (Siljik-gun).
First appearing in historical records in 102, Siljik was at that time an independent state strong enough to contest for territory with far off Eumjipbeol-guk in present-day Gyeongsan.
Siljik stood on the border between Goguryeo and Silla spheres of influence in the early Three Kingdoms period, making it of great strategic interest to both countries.
In addition, the title of "King of Siljik" was revived by Taejo at the beginning of the Goryeo dynasty.
He bestowed this title on Kim Wi-ong, a scion of the Silla royal house.