- Race Car Dealers, Oshawa
- Racing Car Supplies, Oshawa
- Radiator Coolant & Solvents, Oshawa - Engine Coolant
- Radio & Television Repair Shops , Oshawa - TV Repair
- Radio Communications Equipment & Systems , Oshawa
- Radio Stations & Broadcasting Companies, Oshawa
- Radiotelephone Communications, Oshawa
- Railroad Services, Oshawa
- Reading Instruction Schools, Oshawa
- Ready Mix Concrete, Oshawa - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Oshawa
- Real Estate, Oshawa - Agent, Broker & Companies
- Real Estate Agencies, Oshawa
- Real Estate Agent & Broker Services, Oshawa
- Real Estate Agent - Property Lessors, Oshawa
- Real Estate Appraiser, Oshawa - Appraisal Services
- Real Estate Appraisers & Consulting Services, Oshawa
- Real Estate Broker, Oshawa
- Real Estate Consultants, Oshawa
- Real Estate Developers, Oshawa
- Real Estate Management, Oshawa
- Real Estate Properties, Oshawa
- Real Estate Property Investment Properties, Oshawa
- Real Estate Rentals, Oshawa
- Real Estate Services, Oshawa
- Real Estate Staging Service, Oshawa
- Record Destruction Service, Oshawa
- Record Storage, Destruction & Management, Oshawa
- Recording Studio - Equipment & Rental, Oshawa
- Recording Studio Service - Sound & Video, Oshawa
- Records, Tapes, CDs - Used & Vintage, Oshawa
- Recreational Equipment & Supplies Companies, Oshawa
- Recreational Organizations, Oshawa
- Recreational Services, Oshawa
- Recycling Drop-Off Centers, Oshawa
- Recycling Scrap & Waste Materials, Oshawa - Scrap Metal, etc
- Reducing Exercise & Weight Control Services, Oshawa
- Reflexologists, Oshawa
- Refrigeration & Air Conditioning Contractors, Oshawa - Installation, Repair, Sales & Service
- Refrigeration & Cooling Equipment, Parts & Supplies , Oshawa - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Oshawa - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Oshawa - Fridge
- Refuse Collection & Disposal Services, Oshawa
- Refuse Systems & Garbage Disposal, Oshawa
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- Rehabilitation Centers, Products & Services, Oshawa
- Rehabilitation Specialists, Oshawa
- Rehabilitational Job Training Services, Oshawa
- Relief Organizations, Oshawa
- Religious Education, Oshawa
- Religious Goods & Church Supplies Stores, Oshawa
- Religious Organizations, Oshawa
- Rental & Leasing Business Equipment, Oshawa
- Repair Services, Oshawa
- Research & Development Bureaus, Oshawa - Commercial, Economic, Sociological & Educational Research
- Research & Development Labs, Oshawa - Laboratories
- Research Service Libraries, Oshawa
- Research Services, Oshawa
- Residential, Oshawa
- Residential Apartments, Oshawa
- Residential Care Facilities, Oshawa
- Residential Construction Contractors, Oshawa - General Contractors
- Residential Electricians, Oshawa - Electric Contractors
- Restaurant & Food Service Management Services, Oshawa
- Restaurant & Lounge, Bar, Or Pub, Oshawa
- Restaurant Equipment, Oshawa
- Restaurant Equipment & Supplies, Oshawa
- Restaurant Supplies & Equipment, Oshawa
- Restaurants - Breakfast Brunch Lunch, Oshawa
- Restaurants/Food & Dining, Oshawa
- Restoration Contractors, Oshawa
- Resume Service, Oshawa
- Retail Book Stores, Oshawa
- Retirement & Estate Planning, Oshawa
- Retirement Communities & Home, Assisted Living & Apartments, Oshawa
- Retirement Planning Consultants & Services, Oshawa
- Ricoh Copy Machines, Oshawa
- Riding & Rodeo Services, Oshawa
- Road Construction, Oshawa - Companies & Contractors
- Road Construction & Repair Contractors, Oshawa
- Roadside Assistance, Road Service & Towing Service, Oshawa
- Rods, Springs & Suspension Equipment & Supplies, Oshawa
- Roofing Consultants, Oshawa - Roofing Companies
- Roofing Contractors, Oshawa - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Roofing Materials & Supplies, Oshawa
- Rubber Products, Oshawa
- Rubber Products - Retail, Oshawa
- Rubber Stamps, Oshawa
- Ryder Truck Rental , Oshawa - Ryder Moving
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