This article aims to discuss the values of nationalism and behavioral conducts in Madurese Local Wisdom (MLW). The methodological approach used to achieve the objectives is qualitative. The data was obtained from participant observations and interviews. The collected data was then classified and interpreted in the form of descriptive qualitative analysis. This research resulted in the finding that the values of nationalism and behavioral conducts in Madurse Local Wisdom (MLW) plays important roles in maintaining harmonious relationships in the process of communication and interaction and can be used as a reference for the ideal coexistence within the Madurese Ethnic (ME) themselves and between the ME and other ethnic environments. The results are expected to be used as a reference particularly by the local government to regrow and rebuild the values of integrity and national identity in Madurese community, as an effort to prepare the ideal social environmental condition within the post-opening of the longest bridge in Indonesia.The results of this study are also expected to contribute to a deeper thought for further research in the area of cultural diversity through a better understanding of local wisdom, the result of which can be used as a reference for parents, cultural experts and scientists as well as related institutions in their attempts of strengthening the values of nationalism and behavioural conducts of the nation through a better understanding of local wisdom correctly and comprehensively. All of these can be used as media for reimplanting noble character of the nation, improving harmony in all aspects of national life and prevent violence, which can cause fear and worry towards other ethnic and other nations.