This study examined legislature-executive pattern of relations in the Nigeria’s democratic governance of the Fourth Republic and its implication on good governance. To realize the above aim, the study relied on descriptive qualitative method and separation of power theory. It also relied on secondary data which included journal articles, textbooks, executive-legislature documents and the 1999 Constitution of the federal republic of Nigeria. The study upon conclusion revealed that legislature-executive pattern of relations in Nigeria since the return of the Fourth Republic in 1999 had been more at loggerheads and crisis-ridden. It also revealed that this pattern of relations between the institutions, on several instances, had only succeeded in holding back good governance and service delivery to Nigerians. Their crises often overheated the polity, resulting into political instability, delay in the passing of bills and national budget among others. Based on the available revelations above, the study concluded that better relations, democratic consolidation and good governance can only be achieved when the executive and the legislature promote and adhere to the separation of power principles. They must maintain their constitutional jurisdiction to promote an enduring democratic practice, political stability and full representation of the people. The study will be relevant to the institutions, the public, and researchers alike. Further study can also be conducted on executive-judiciary relations under the Fourth Republic.