Battle of Ontario

Battle of Ontario
	Ottawa Senators Toronto Maple Leafs
First meeting	October 20, 1992
Latest meeting	May 1, 2025
Next meeting	TBD
Statistics
Meetings total	177
All-time series	88–73–3–13 (TOR)
Regular season series	76–55–3–13 (OTT)
Postseason results	20–10 (TOR)
Largest victory	OTT 8–0 TOR; October 29, 2005
Longest win streak	OTT W7
Current win streak	OTT W5
Postseason history
	2000 conference quarterfinals: Maple Leafs won, 4–2; 2001 conference quarterfinals: Maple Leafs won, 4–0; 2002 conference semifinals: Maple Leafs won, 4–3; 2004 conference quarterfinals: Maple Leafs won, 4–3; 2025 first round: Maple Leafs won, 4–2;

The Battle of Ontario (French: Bataille de l'Ontario) is a National Hockey League (NHL) rivalry between the Ottawa Senators and the Toronto Maple Leafs. Both teams compete in the Atlantic Division and with current NHL scheduling, they meet three to four times per season. Games between the teams are often televised nationally on Hockey Night in Canada. The rivalry has been described as one of the NHL's top rivalries due to the two teams meeting each other in the postseason throughout the early 2000s.