• March 28 – April 1 – In the Easter Riots in Quebec City, the Militia suppress anti-conscription protesters. Four civilians are killed.
• March 30 – C Squadron of Lord Strathcona's Horse (Royal Canadians) conducts a cavalry charge against the Germans at Moreuil Wood. The squadron suffers atrocious casualties, but the action is one of the keys of halting the German advance in Operation Michael. Lieutenant Gordon Flowerdew will be awarded the Victoria Cross posthumously.
• April 21 – Canadian Captain Roy Brown (209 Squadron, RAF) supposedly shoots down the famed Red Baron. More accepted theories credit either Sergeant Cedric Popkin (Australian 24th Machine Gun Company), Gunner Snowy Evans or Gunner Robert Buie (both of 53rd Battery, 14th Field Artillery Brigade, RAA) with the kill.
• May 24 – Canadian women (except status Indians) obtain the right to vote in federal elections (even if they did not yet have the right to vote in provincial elections); some limited women's suffrage had been granted the year earlier. Status Indians gained federal suffrage in 1960.
• August 8 – World War I: At the Battle of Amiens superior Canadian gunners assist a great allied breakthrough (also called Canada's 100 Days).
• August 26 – September 3 – Battle of Arras, 1918.
• September – Canadian forces arrive in northern Russia to assist the White Russians in their battle against the Bolsheviks.
• September 2–3 – Battle of Drocourt-Quéant Line.
• September 9–12 – Battle of the Hindenburg Line.
• September 27 – October 2 – Battle of Canal du Nord.
• October – A second group of Canadian forces is sent to Siberia.
• October 8–9 – Battle of Cambrai (1918).
• November 1–2 – Battle of Valenciennes.
• November 11 – The First World War ends. Over 600 000 Canadians fought in Europe: 70 000 were killed and 173 000 were wounded. 

"Your Legion Needs You"