The purpose of this paper is to verify the accountability and transparency in urban planning in Denmark after analyzing the history of decentralization, urban planning system, and public participation. Since the start of decentralization in 1970s, the governance structure of Denmark has been evenly trifurcated into three tiers, national, county, and local levels. Beyond what is required by the planning act, municipalities encourage public participation by making announcements in various medias and cooperating with resident groups from the beginning of local planning process. This results in increased accountability and transparency in local governance in Denmark.