The chapter “Offshore Oil Production Installations” presents an overview of the main types of offshore oil and gas production systems, describing their structural configurations, functional components, and operational principles. It classifies offshore facilities into fixed, floating, and subsea systems, explaining how factors such as water depth, environmental conditions, and field characteristics determine the most suitable installation type. The chapter also introduces key elements of production systems, including subsea equipment, risers, flowlines, and topside modules, emphasizing their integration for efficient hydrocarbon processing. Additionally, it highlights the importance of safety management during Simultaneous Operations (SIMOPS), where multiple offshore activities occur concurrently, requiring strict coordination and risk control. Overall, the text provides a concise yet comprehensive foundation for understanding the engineering, operation, and safety aspects of offshore production facilities.