Ralph Ignatius Thomas Alles (3 October 1932 - 28 November 2013) was a Sri Lankan educationalist. He served as the State Secretary for Ministry of Education from 1989 to 1993 and was the Chairman of the Gateway Group till his death. He was the founding principal of D. S. Senanayake College.
Alles started his career as a teacher, eventually becoming an assistant principal at Royal College Colombo in Colombo, the leading public school in Sri Lanka, and helped to establish D. S. Senanayake. In 25 years at the school, he helped turn it into one of the leading schools in Sri Lanka, expanding from 167 students to over 5000. There after he established the Gateway International School.
Married to Rohini Alles who is also a teacher at Royal College Colombo, they had three sons Tiran, Harsha & Malik. Tiran Alles was a leading businessmen, politician in the country, married to Lydia Alles and Dr Harsha Alles is a medical doctor turned cooperate executive in the Gateway Group, married to Dinali Alles. His youngest son, Malik Alles died at the age 17 due to a sporting accident at his alma mater D.S. Senanayake College.