The Alumni of Royal College goes far back, stronger and established as an organization in the name of “Royal College Union”.

The Royal College Union (RCU) is the alumni association of the Royal College Colombo. Founded in 1891 as a society for alumni of the college, it is the oldest such alumni society in Sri Lanka. The Royal College Union was set up to further the interests of the College and its past and present members, and to keep former pupils in touch with each other and with the school. Annually the RCU organizes many sporting events including the Royal-Thomian Cricket Encounter, the Bradby Shield Encounter, the Royal Thomian Regatta as well as national initiatives such as EDEX and carry out development projects for the college, as well as manage and maintain much of the school’s infrastructure such as the Hostel, Royal College Sports Complex, the J.R. Jayawardene Sports Complex, RCU Skills Centre and the Swimming Pool.