St. Peter's College (Sinhala: සාන්ත පීතර විදුහල, Tamil: செயிண்ட் பீட்டர் கல்லூரி) is a Roman Catholic boys-only primary to secondary (inclusive) school in the Bambalapitiya zone of Colombo, Sri Lanka, founded in 1922.

Construction began on 7 July 1921 under the supervision of J. R. J. Jayesuria, an alumnus of St. Joseph's College.

In December 1921, Le Goc announced that St. Joseph's College South would open in January 1922.

Le Goc with a large number of Josephian students and Staff opened the new school.

The period 1956 to 1977 covers the Rectorships of Five Rectors, all of whom were dogged by the problem of the schools takeover bid, with severe financial constraints consequent to the decision by St. Peter's not to be vested with the State but to function as a 'Non-Fee Levying Private School'.

Nevertheless, and notwithstanding each of the five Rectors of this difficult era made their individual contribution to the progress of St. Peter's never succumbing to problems of the times.

Basil Wiratunge as the Third Rector of St. Peter's from 1956 to 1963, developed Aesthetic Studies and started the first school's Fife and Drum band on 30 June 1956.

A Cultural Centre to promote Music, Drama, Dancing and Art was started in November 1956 with the help of Fathers Mervyn Weerakkody and Marcelline Jayakody.

Arthur Nicholas Fernando set up the Welfare Society, a modern canteen, and college boarding.

Mervyn Weerakkody succeeded Arthur Nicholas Fernando and was the Fourth Rector from 1963 to 1971.

He decentralised the administration with the appointment of Sectional Heads from Grade 6 to the Advanced Level.

He built a vocational training centre with a computer lab, audiovisual studio, science laboratory building, a swimming pool complex, a new primary school building, a new dental clinic, a canteen and a mini zoo for the primary school.

He set up scholarship funds to support students entering university and established a board of administration to assist in managing the school.

The Udugampola Branch School was opened on 24 September 2005 by Archbishop Gomis, and Rev.

Siri Cooray was appointed Principal of the Branch Schools of both Gampaha and Udugampola in January 2007.

From 1927 to 1977, a period of 50 years, the college Rector was ex-officio the President of the Old Boys' Union.

Maurice Perera and George Wijesinghe was appointed to draft a new constitution incorporating the new proposal.