ONYX INTEGRATED SERVICES NIGERIA LIMITED (OISL) is an indigenous Company incorporated in Nigeria, a product of the Nigerian National Petroleum Corporation (NNPC) with 100% local content drive.

ONYX INTEGRATED SERVICES NIGERIA LIMITED (OISL) was established for the purpose of Mechanical, Civil, Electrical Construction/Fabrication works and other related activities and has grown to be a renowned technical company. From minor maintenance and engineering outfit for the minor works to a major maintenance, fabrication / construction and procurement outfit carved particularly for both major industries and governmental organisation.