Urban waterfronts have become key sites where global restructuring processes and local interests are engaged in complex struggles that are influencing the future of cities. The author discusses three issues related to these struggles. First, new waterfront spaces are emerging from a convergence of economic restructuring, globalization and technological changes. Second, port security has become an increasingly important factor in waterfront developments and port-city relations. And third, urban waterfront developments are part of the construction of socio-nature. Following a discussion of these issues, the author suggests that new policies are needed for waterfront development.