This is a list of electoral districts or ridings in Canada for the Canadian federal election of 1917 and 1921.

Electoral Districts are constituencies that elect Members of Parliament in Canada's House of Commons.

Nova Scotia

• Antigonish—Guysborough
• Cape Breton South and Richmond *
• Colchester
• Cumberland
• Digby and Annapolis
• Halifax*
• Hants
• Inverness
• Kings
• Lunenburg
• North Cape Breton and Victoria
• Pictou
• Shelburne and Queen's
• Yarmouth and Clare

Prince Edward Island

• King's
• Prince
• Queen's *

When the new arrangement was divised in 1914 it gave PEI only three seats. After public complaints the rule that a province could not have fewer MPs than Senators was introduced giving PEI back a foruth seat. The arrangment with only three PEI seats was never used in an election.

New Brunswick

• Charlotte
• Gloucester
• Kent
• Northumberland
• Restigouche—Madawaska
• Royal
• St. John—Albert *
• Sunbury—Queens
• Victoria—Carleton
• Westmorland
• York—Sunbury

Quebec

• Argenteuil
• Bagot
• Beauce
• Beauharnois
• Bellechasse
• Berthier
• Bonaventure
• Brome
• Chambly—Verchères
• Champlain
• Charlevoix—Montmorency
• Châteauguay—Huntingdon
• Chicoutimi—Saguenay
• Compton
• Dorchester
• Drummond—Arthabaska
• Gaspé
• George-Étienne Cartier
• Hochelaga
• Hull
• Jacques Cartier
• Joliette
• Kamouraska
• L'Assomption—Montcalm
• L'Islet
• Labelle
• Laprairie—Napierville
• Laurier—Outremont
• Laval—Two Mountains
• Lévis
• Lotbinière
• Maisonneuve
• Maskinongé
• Matane
• Mégantic
• Missisquoi
• Montmagny
• Nicolet
• Pontiac
• Portneuf
• Quebec County
• Quebec East
• Quebec South
• Quebec West
• Richelieu
• Richmond—Wolfe
• Rimouski
• Shefford
• Sherbrooke (Town of)
• St. Ann
• St. Antoine
• St. Denis
• St. Hyacinthe—Rouville
• St. James
• St. Johns—Iberville
• St. Lawrence—St. George
• St. Mary
• Stanstead
• Témiscouata
• Terrebonne
• Three Rivers and St. Maurice
• Vaudreuil—Soulanges
• Westmount—St. Henri
• Wright
• Yamaska

Ontario

• Algoma East
• Algoma West
• Brant
• Brantford
• Bruce North
• Bruce South
• Carleton
• Dufferin
• Dundas
• Durham
• Elgin East
• Elgin West
• Essex North
• Essex South
• Fort William and Rainy River
• Frontenac
• Glengarry and Stormont
• Grenville
• Grey North
• Grey Southeast
• Haldimand
• Halton
• Hamilton East
• Hamilton West
• Hastings East
• Hastings West
• Huron North
• Huron South
• Kent
• Kingston
• Lambton East
• Lambton West
• Lanark
• Leeds
• Lennox and Addington
• Lincoln
• London
• Middlesex East
• Middlesex West
• Muskoka
• Nipissing
• Norfolk
• Northumberland
• Ontario North
• Ontario South
• Ottawa (City of) *
• Oxford North
• Oxford South
• Parkdale
• Parry Sound
• Peel
• Perth North
• Perth South
• Peterborough East
• Peterborough West
• Port Arthur and Kenora
• Prescott
• Prince Edward
• Renfrew North
• Renfrew South
• Russell
• Simcoe East
• Simcoe North
• Simcoe South
• Timiskaming
• Toronto Centre
• Toronto East
• Toronto North
• Toronto South
• Toronto West
• Victoria
• Waterloo North
• Waterloo South
• Welland
• Wellington North
• Wellington South
• Wentworth
• York East
• York North
• York South
• York West

Manitoba

• Brandon
• Dauphin
• Lisgar
• Macdonald
• Marquette
• Neepawa
• Nelson
• Portage La Prairie
• Provencher
• Selkirk
• Souris
• Springfield
• Winnipeg Centre
• Winnipeg North
• Winnipeg South

Saskatchewan

• Assiniboia
• Battleford
• Humboldt
• Kindersley
• Last Mountain
• Mackenzie
• Maple Creek
• Moose Jaw
• North Battleford
• Prince Albert
• Qu'Appelle
• Regina
• Saltcoats
• Saskatoon
• Swift Current
• Weyburn

Alberta

• Battle River
• Bow River
• Calgary West
• East Calgary
• Edmonton East
• Edmonton West
• Lethbridge
• Macleod
• Medicine Hat
• Red Deer
• Strathcona
• Victoria

British Columbia

• Burrard
• Cariboo
• Comox—Alberni
• Kootenay East
• Kootenay West
• Nanaimo
• New Westminster
• Skeena
• Vancouver Centre
• Vancouver South
• Victoria City
• Westminster District
• Yale

Yukon

• Yukon

*returned two members