Marine engineering systems, particularly in the oil and gas industry, require effective maintenance operations to ensure their dependability and efficiency. This paper discusses various organizational designs for maintenance departments to increase performance levels and reduce downtime. It examines the functions, responsibilities, and workflows of teams involved in maintenance, emphasizing human factors, such as fatigue, communication, decision-making, situational awareness lapses, and ergonomics. The human element is identified as a major cause of most accidents in the shipping sector, posing a significant threat to maritime safety. Enhancing the focus on the human element is a collective responsibility among the International Maritime Organization (IMO), Member States, companies, and seafarers. In its Strategic Plan (2018–2023), the IMO has incorporated human factors into training, regulations, and safety practices. This study highlights the influence of human factors on maintenance effectiveness, safety, and efficiency. It assesses existing training programs and identifies the need for customized modules tailored to marine maintenance personnel. By developing a well-designed maintenance organization supported by targeted training addressing key human factors, significant improvements in operational efficiency, equipment reliability, and overall system performance can be achieved. This research offers practical insights for optimizing maintenance organizations in the marine sector.