The Livingston, West Lothian, company uses remotely operated aerial vehicles to conduct surveys of structures such as oil rigs, pylons, wind turbines and industrial chimneys.
It says this allows the infrastructure to continue to run during the inspections and save operators the cost of shutting down their assets.
Mr Marchant said: "I am looking forward to working with Cyberhawk. It's a prime example of how new technology combined with high-level engineering expertise and entrepreneurial drive can create something as innovative and comprehensive as Cyberhawk's service.
"I am impressed with the management team and their plans for the future. Their ideas for creating increased value to their customers using new technology are exciting and I am relishing the opportunity to be involved in bringing Cyberhawk's solution to more customers globally."
The appointment comes just a few months after Scottish Equity Partners invested £1.25 million in Cyberhawk to expand the business into new markets and countries.
Its customers already include SSE, Shell, ExxonMobil, ConocoPhillips, Total, Centrica and Statoil.
Aubrey Thompson, Cyberhawk's chairman, said: "The recent equity investment positions us to better serve our growing customer base worldwide.
"We are now strengthening the Board to give us greater insight into our customer needs and expectations. Ian's decision to join our board as a non-executive director is a huge vote of confidence from someone who is recognised nationally and internationally as a leader in the energy industry."
Mr Marchant is also senior non-executive director at oil services giant Wood Group and chairman of industry body the Energy Institute.