Sigma Engineering Works LLC (SEW) is an engineering service company located in Abu Dhabi, United Arab Emirates. Established in 1996, it is part of Mazrui Energy Services and specializes in providing a wide range of services for the oil and gas industry. SEW is known for its commitment to customer excellence and quality management.

The company offers various services, including fabrication and manufacturing, mechanical repairs, advanced machining, bevelling and welding, and valve overhaul and repair. SEW also collaborates with strategic partners, such as Alliance One Oilfield, to supply and refurbish drilling equipment. Its large facility in Mussafah spans over 22,000 sqm, featuring a workshop area of around 15,000 sqm. Sigma Engineering Works holds multiple certifications, including ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018, ensuring high standards in quality, environmental management, and occupational health and safety.