As the world seeks sustainable energy solutions to combat environmental challenges, the focus on green hydrogen production has gained momentum. Hydrogen, particularly green hydrogen produced through water electrolysis, has emerged as a clean energy alternative that could mitigate carbon emissions. In countries like Korea, governments are setting ambitious targets to boost green hydrogen production, aiming to produce millions of tons annually by 2050. Offshore wind farms, both fixed and floating, are being explored as key components of this energy transition. While fixed wind farms near the coast have limitations, floating offshore wind farms offer vast potential, especially in regions with abundant deep-sea wind resources. Recent studies propose producing hydrogen at sea, bypassing the need for direct grid connections and addressing challenges related to installation costs and grid connections. Integrating green hydrogen production with offshore wind farms could result in significant cost savings and environmental benefits. Various methods such as PEM electrolyzer and alkaline water electrolysis are being studied for offshore hydrogen production, with decentralized approaches showing promising cost-effectiveness. Economic evaluations indicate that decentralized hydrogen production in offshore wind farms can be as low as £2/kgH2 at 100 km, making it a competitive option for green energy production. While challenges remain, innovative solutions and research advancements in offshore-based hydrogen synthesis are paving the way for a more sustainable and efficient energy landscape.