The London Engineering Project hopes that the ambassadors will inspire school pupils from the BME community to follow them into the science and engineering industry, where ethnic minorities are currently under-represented.
Communitas will reach out via specialist press such as Voice, New Nation and Muslim Weekly. It is also in talks with mosques and black churches, asking for the ambassador vacancies to be mentioned during religious services.
The agency will also approach employers in an attempt to get information circulated on intranets.
The project will initially target people in south London, but it is likely to extend across London.
The partnership of academic institutions, charities, industry and government was set up by the Royal Academy of Engineering.