ISIS (Islamic State of Iraq and Syria) is a radical Islamic movement, which was declared by Abu Bakar al-Baghdadi and it wanted to enforce the Islamic caliphate in Iraq and Syria. Meanwhile, Hizbut-Tahrir (HT) is also a radical Islamic movement that has the ideals of the Islamic caliphate. However, the two movements have different ways of realizing these ideals. This article aims at explaining the views of the Hizbut Tahrir to the ways in realizing the movement of ISIS in actualizing the Islamic caliphate. The findings in this study were that both the radical Islamic movements of Hizbut Tahrir and ISIS have the same ideals in enforcing the Islamic caliphate, but they have different ways to achieve this goal. Hizbut-Tahrir did not agree and even refused against the enforcement of the Islamic caliphate carried by ISIS using the violence. Hizbut Tahrir considers that the enforcement of the Islamic caliphate conducted by ISIS does not meet the four conditions offered by the Hizbut Tahrir. Thus, in the view of the Hizbut Tahrir, the enforcement of ISIS caliphate is not according to the teachings of the Prophet when establishing an Islamic state.