As floating offshore wind energy becomes an increasingly viable solution for harvesting renewable energy in deep-water regions, understanding and optimizing operations and maintenance (O&M) costs is essential for ensuring economic sustainability. This thesis aims to investigate main O&M strategies for floating offshore wind farms in the Mediterranean Sea region, due to its potential in both production and accessibility, with a particular emphasis on operational expenditure (OPEX) modeling, by considering the components more prone to failure, the metocean conditions and weather windows. The thesis is organized as follows: firstly, an analysis about existing ports and vessels availability in the Mediterranean region is conducted, to provide context about the current logistic infrastructure to support the growing interest around FOWT.