The melting of polar ice due to climate change coupled with land subsidence from the extraction of groundwater and subsurface hydrocarbons will likely see the continued rise of global sea-levels into the twenty-first century and beyond. Yet, many coastal megacities continue to experience increased migration, largely due to the availability of economic opportunities, which will increase the number of people living in low-elevation coastal zones (LECZ) that are highly susceptible to flooding and sea-level rise. This combination of land scarcity and sea-level rise has led to the United Nations (UN) convening its inaugural Round Table on Sustainable Floating Cities in 2019, where the UN Deputy Secretary-General Amina Mohammed proclaimed that “floating cities are a means of ensuring climate resilience, as buildings can rise along with the sea”. From this chapter onwards, we will shift our analysis towards that of floating structures as a means for climate adaptation and coastal resilience. We will first introduce the conditions governing their hydrostatic stability in the absence of waves, before discussing the dynamics of floating structures subjected to regular or irregular waves.