STC Gurutalawa

S. Thomas College, Gurutalawa – http://www.stcguru.com
S. Thomas’ College, Gurutalawa OBA - http://www.stcgoba.com/ www.stcgoba.org
Guru Support Group – http://www.facebook.com/group.php?gid=20573160207

STC Mount Lavinia

S. Thomas College. Mt Lavinia – http://www.stcmount.sch.lk
S. Thomas College Mt Lavinia OBA – http://www.stcmloba.org
S.Thomas' College PTA - http://www.stcpta.org
S. Thomas’ College, Mt. Lavinia - Battle of the Blues Royal - Thomian Cricket Encounter - http://www.royalthomian.info
The S.Thomas’ College Old Boys’ Forum - http://www.tyretracks.com/index.php
Old Thomians' Rugby Football Union - http://www.otrfu.com
Old Thomian Swimming Club - http://www.otscml.com
Class of 1971 - http://www.stc-class-of-1971.com
Class of 1972 - http://www.stcmloba.org/class_of_72new.htm
Class of 1974 - http://www.stcoba.org
Class of 1975 - http://www.stcmloba.org/html/Class75/75 Class1.htm
The Class of 1983 - http://www.sthomascollege.com
Thomian Class of '87 - www.stc87batch.org

Thomian Batch of 1988 - 2001 - www.thomians.4t.com
Class of 1990 - http://www.stcmlclassof1990.org
The Class of '92 - http://www.stc-class92.org/
Class of 1993 - www.geocities.com/stc_classof93

STC Class of 1994 - www.stcclassof94.com

STC Bandarawela

S. Thomas’ College Bandarawela - http://www.stcb.sch.lk/
S. Thomas College Bandarawela OBA –http://www.stcbwoba.nz.wb.gs/s-thomas-college-bandarawela-oba.html
S. Thomas College Bandarawela OBA – http://stcboba.org/

STPS Kollupitiya

S. Thomas’ Preparatory School - OBU – http://www.prepobu.lk

USA

East Coast Thomians Association, USA – http://www.thomians.org 
Old Thomians Association of California - http://www.thomians.com

Canada

STC OBA of Canada - http://www.stcoba-canada.com

Australia

STC OBA Sydney, NSW, Australia - http://www.stcobasydney.com

STC OBA (Australia Branch), Victoria - http://www.stcobaaust.org.au/

United Kingdom

The Old Thomians Association in the UK - http://otauk.co.uk
Old Thomians' Association (UK) - http://www.otauk.org

General

Our 'Mother School' - www.etoncollege.com

St. Thomas' Sri Lanka - http://www.facebook.com/group.php?gid=4756031708
Dr R L Hayman's alma mater - Sherborne - http://www.sherborne.org/home

Gordonstoun School - http://www.gordonstoun.org.uk/