처음에 내성사였으나 조선시대 숙종이 진주성 싸움에서 전사한 승병의 넋을 기리기 위해 호국사라는 이름을 내렸다.
Initially, it was a Naesoengsa temple, but it was named Hoguksa Temple to commemorate the soul of a monk who died in the battle of Jinju Fotress during the Joseon Dynasty.