Climate change poses significant threats to global security and trade. This special issue identifies key challenges faced by ports and supply chains from climate change over the next century, with perspectives from researchers, practitioners, and decision-makers who have expertise in ports, supply chains, and natural hazards. Many ports regularly experience natural hazard events and about a third of the world's ports lie in the path of tropical storms (Becker et al. 2012). Climate change will likely amplify the impacts of future coastal hazards for many of the world's 3,700 maritime ports (Verschuur, Koks, and Hall 2020) and their supply chains that enable global and local commerce. Indeed, ports fulfill a wide variety of critical functions for the local, regional, and global economy (Hall 2007; Baird 2004; Goss 1990). They provide jobs, facilitate trade, and serve as links between the hinterlands (back region) and the forelands (seaward region) of their markets. Most coastal cities grew around a port hub and global trade routes then evolved into a network that now connects port cities across the world. This 'inter-connectedness' means that even a short-term loss of port capacity (e.g., due to a natural disaster) can cause local and global ripple effects in logistics and trade-dependent industries (Becker et al. 2018; Lim-Camacho et al. 2017; Levermann 2014), such as imported food, energy, and assembled products. Projected climate changes include an increase in the frequency and intensity of 'extreme' atmospheric events-shocks such as storms, heavy precipitation, and heat waves (USGCRP 2017; NCA 2014); as well as longer-term changes to climatic variables resulting in 'slow onset' changes like sea level rise, wave climatology, and sea-surface salinity (leading to higher rates of corrosion). In the last 15 years, attention to these issues has increased in both the academic and practitioner spheres. However, as recently as the late 2000's, most ports primarily considered climate change to be a call to reduce their emissions and go green. To provide a resource for best practices, the World Port Climate Initiative formed to help ports quantify their carbon footprint and implement various emissions-reduction strategies. In the US, the Environmental Protection Agency developed new programs to help ports offset some of the costs for these new clean investments. These efforts may help reduce the rate of global warming, but as awareness of the implications of climate change has grown and the science has evolved, ports and supply chains have begun to recognize the dire situation they will face in the coming decades. A number of maritime industry groups have thus added 'climate adaption' to their agenda. Guidance documents have emerged, with lessons learned and best practices highlighted. The World Association for Waterborne Transport Infrastructure (PIANC), for example, recently released the Resilience of the Maritime and Inland Waterborne Transport System, to 'provide a summary of the state of knowledge concerning the shor...