Engineering Systems International S.P.C. (ESi) is an Oman-based trading and engineering services company specializing in the import and export of technical equipment, accessories, and raw materials. The company serves engineering and related sectors with products sourced from around the world, including engineering machinery and tools, electronic components, laboratory and workshop equipment, computers, networking equipment, and customized computing solutions. Its materials range includes glass-reinforced plastics, carbon fibre, composites, engineering metals, and industrial and electronic raw materials. ESi also offers fixed-wing, multirotor, and hybrid VTOL unmanned aerial vehicles, together with accessories and communications and survey equipment.

Its services span telecommunications, networking, IT support, software development, cybersecurity, consulting, supply-chain design, transportation, warehousing, process improvement, and workforce provision. For monitoring and survey needs, the company supports applications such as premises security, coastal and wildlife monitoring, agriculture, and oil and gas field monitoring, as well as aerial photography. Its engineering expertise includes mechanical design and manufacturing, electronics and avionics design and fabrication, and aerospace and air-vehicle design and fabrication. ESi is based in Muscat, Oman.