Engineers
- Vidya Jyothi E.O.E. Pereira - Founder of the Faculty of Engineering, University of Peradeniya (note: - Also listed in Academics)
- C.L.V. Jayathilake - former Dean Faculty of Engineering, University of Peradeniya (note: - Also listed in Academics)
- Kanagaratnam Sriskandan - Former Chief Highway Engineer, the Department for Transport
- Major General V.U.B. Nanayakkara, USP, Hdmc, SLE - current Chief Field Engineer Sri Lanka Army (note: - Also listed in Military)
- U.N.Gunasekera - Construction magnate (note: - Also listed in Industrialist)
- S.C. Amarasinghe - former Managing Director of the Ceylon Electricity Board
- D.A.I.Munindradasa - Defence Advisor (note: - Also listed in Academics)
- Malith Mendis - CEO, Lanka Hydraulic Institute
Read more about this topic: List Of Royal College Colombo Alumni