This paper explains the dynamics of thought in the Halaqah Fikih Peradaban (Fiqh of Civilization Halaqah, HFP) at pesantren (Islamic boarding school) ideologically affiliated with NU. The spirit of fiqh contextualization developed in the Fiqh of Civilization Halaqah is a key idea of PBNU in initiating civilization fiqh as a new approach to understanding and studying Islamic heritage. This paper elaborates on two aspects. First, why PBNU initiated the Fiqh of Civilization Halaqah and how the dynamics of thought occur within it. Second, how pesantren affiliated with NU discuss one of the main focuses of the Fiqh of Civilization Halaqah related to nationality and statehood. The authors use the theory of Islamic Law Sociology to explain the reciprocal relationship between the socio-religious topics discussed in the Fiqh of Civilization Halaqah and the dynamic and critical way of thinking. This paper uses qualitative research. The primary data was obtained through interviews with several sources and five caretakers who conducted the Fiqh of Civilization Halaqah in five pesantrens. Supporting data was obtained from documents and other news sources that review the Fiqh of Civilization Halaqah. The research results show that the reason for the Fiqh of Civilization Halaqah initiated by PBNU is to create a discourse space for contextualizing progressive fiqh understanding and developing a dynamic way of thinking. Through this approach, fiqh can be used as an inclusive perspective in understanding social change and the development of the times. This study also shows that the theme of nationality and statehood (fiqh siyāsah) discussed in the Fiqh of Civilization Halaqah in five Pondok Pesantren (Islamic boarding school) promotes dynamic and progressive thinking while critiquing fiqh siyāsah studies limited to the khilāfah. This attitude aligns with the spirit of civilization fiqh initiated by PBNU, which emphasizes a dialectical perspective in studying Islamic heritage.