Ontario Association For Infant And Child Development
Ontario Circuit 017b Of Jehovah's Witnesses
Ontario Community Emergency Assistance Program
Ontario Conference Of The Seventh-day Adventist Church
Ontario Cultural Society Of The Deaf
Ontario Municipal Management Institute
Ontario Philharmonic
Ontario Volunteer Emergency Response Team (overt) Inc
Opera Oshawa
Oshawa & District Ostomy Association
Oshawa Aeronautical,military & Industrial Museum
Oshawa Block Parent Association Incorporated
Oshawa Choral Society
Oshawa Christian Fellowship
Oshawa Civic Band Inc.
Oshawa Community Health Centre
Oshawa Folk Arts Council
Oshawa Garden Club
Oshawa Hillsdale Congregation Of Jehovah's Witnesses
Oshawa Korean Presbyterian Church