A systems integrator is a person or company that specializes in bringing together component subsystems into a whole and ensuring that those subsystems function together, a practice known as system integration. Systems integrators may work in many fields but the term is generally used in the information technology (IT) field, the defense industry, or in media.

According to the Institute for Partner Education & Development, systems integrators traditionally realize approximately 50 percent of revenue from consulting services and 40 percent of revenue from IT services in design, implementation and post-transaction consulting. They are different from an IT Consultant in that they also take title to product.