Global change driven by anthropogenic pressures has profoundly affected ocean biogeochemical cycles. Natural fluxes have been disrupted due to imbalances, often in excess, of key elements like carbon, nitrogen, and phosphorus. These increases are direct consequences of higher greenhouse gas emissions, pollution, land-use changes, the use of fertilizers, and other human activities. Consequently, ocean acidification, eutrophication, depletion of natural resources, and disturbance of marine habitats have been observed, all of which compound and contribute to further global change impacts. Ongoing research focuses on improving models of biogeochemical processes, monitoring changes in ocean chemistry, and assessing the resilience of marine ecosystems. Understanding the complex interactions between global change and ocean biogeochemical cycles is essential for predicting future climate impacts and mitigating the effects of human activities.