List of Ontario railways

The following railways operate in the Canadian province of Ontario.

Common freight carriers

 * Barrie Collingwood Railway (BCRY)
 * Canadian National Railway (CN) including subsidiaries Algoma Central Railway (AC), Grand Trunk Western Railroad (GTW), and Sault Ste. Marie Bridge Company (SSAM), and lessor Arnprior–Nepean Railway
 * Canadian Pacific Railway (CP)
 * CSX Transportation (CSXT)
 * Essex Terminal Railway (ETL)
 * Goderich–Exeter Railway (GEXR)
 * Huron Central Railway (HCRY)
 * Minnesota, Dakota and Western Railway (MDW)
 * Norfolk Southern Railway (NS)
 * Ontario Northland Railway (ONT) including subsidiary Nipissing Central Railway
 * Ontario Southland Railway (OS)
 * Ottawa Valley Railway (RLK)
 * Southern Ontario Railway (RLHH)
 * Trillium Railway (TRRY) through subsidiaries Port Colborne Harbour Railway and St. Thomas and Eastern Railway

Passenger carriers

 * Amtrak (AMTK)
 * Capital Railway
 * Falls Incline Railway
 * Port Stanley Terminal Rail
 * South Simcoe Railway
 * Via Rail (Via)
 * Waterloo Central Railway
 * York–Durham Heritage Railway
 * Algoma Central Railway (CN)
 * Polar Bear Express (ONTC)

Light Rail Transit

 * Ion rapid transit
 * OC Transpo
 * Toronto Transit Commission

Electric

 * Belleville Traction Company
 * Berlin and Bridgeport Electric Street Railway
 * Berlin and Northern Railway
 * Berlin and Waterloo Street Railway
 * Brantford and Hamilton Electric Railway
 * Brantford Street Railway
 * Buffalo Railway
 * Canadian National Electric Railways
 * Chatham, Wallaceburg and Lake Erie Railway
 * City Railway of Windsor
 * City and Suburban Electric Railway
 * Cornwall Electric Street Railway
 * Cornwall Street Railway, Light and Power Company
 * Davenport Street Railway
 * Fort William Electric Railway
 * Galt and Preston Street Railway
 * Galt, Preston and Hespeler Street Railway
 * Grand River Railway (GRNR)
 * Grand Valley Railway
 * Guelph Railway
 * Guelph Radial Railway
 * Hamilton Cataract Power, Light and Traction Company
 * Hamilton and Dundas Street Railway
 * Hamilton Electric Light and Cataract Power Company
 * Hamilton, Grimsby and Beamsville Electric Railway
 * Hamilton Radial Electric Railway
 * Hamilton Street Railway
 * Hamilton, Waterloo and Guelph Railway
 * Huron, Bruce and Grey Electric Railway
 * Huron and Ontario Electric Railway (c. 1906 planned and never built)
 * Hydro-Electric Railways
 * International Railway
 * International Transit Company
 * Kingston, Portsmouth and Cataraqui Electric Railway
 * Kingston Street Railway
 * Kitchener and Waterloo Street Railway
 * Lake Erie and Northern Railway (LEN)
 * Leander Colt Incline
 * London and Lake Erie Railway and Transportation Company
 * London and Port Stanley Railway (LPS)
 * London Street Railway
 * Maid of the Mist Incline
 * Metropolitan Street Railway
 * Metropolitan Street Railway of Toronto
 * Middlesex and Elgin Inter-urban Railway
 * Mount McKay and Kakabeka Falls Railway
 * Niagara Falls, Park and River Railway
 * Niagara Falls, Wesley Park and Clifton Tramway Company
 * Niagara, St. Catharines and Toronto Railway (NS&T)
 * Niagara, Welland and Lake Erie Railway
 * Nipissing Central Railway
 * North Yonge Railways
 * Ontario Southern Railway
 * Ontario Traction Company
 * Ontario West Shore Railway
 * Ontario West Shore Electric Railway
 * Oshawa Railway
 * Ottawa City Passenger Railway
 * Ottawa Electric Railway
 * Ottawa Electric Street Railway
 * Peterboro and Ashburnham Street Railway
 * Peterboro Radial Railway
 * Port Arthur Civic Company
 * Port Arthur Electric Street Railway
 * Port Arthur and Fort William Electric Railway
 * Port Dalhousie, St. Catharines and Thorold Electric Street Railway
 * Port Dover, Brantford, Berlin and Goderich Railway
 * Preston and Berlin Railway
 * St. Catharines, Merritton and Thorold Railway
 * St. Catharines and Niagara Central Railway
 * St. Catharines Street Railway
 * St. Thomas Street Railway
 * Sandwich, Windsor and Amherstburg Railway
 * Sandwich and Windsor Passenger Railway
 * Sarnia Street Railway
 * Schomberg and Aurora Railway
 * South Essex Electric Railway
 * Southwestern Traction Company
 * Sudbury and Copper Cliff Suburban Electric Railway
 * Toronto Railway
 * Toronto and Mimico Railway
 * Toronto and Mimico Electric Railway and Light Company
 * Toronto and Scarboro' Electric Railway, Light and Power Company
 * Toronto Street Railway
 * Toronto Suburban Railway
 * Toronto Suburban Street Railway
 * Toronto and York Radial Railway
 * Weston, High Park and Toronto Street Railway
 * Whirlpool Rapids Incline
 * Windsor, Essex and Lake Shore Rapid Railway (WE&L)
 * Windsor and Tecumseh Electric Railway
 * Woodstock, Thames Valley and Ingersoll Electric Railway

Private freight carriers

 * Rama Timber Transport Company
 * Nosbonsing and Nipissing Railway
 * Whitney and Opeongo Railway
 * Egan Estates Railway
 * Orangeville Brampton Railway

Passenger carriers

 * Waterloo – St. Jacobs Railway

Never completed

 * Ontario and Pacific Junction Railway
 * Toronto Eastern Railway