Northeastern Ontario

• Algoma Fall Festival (Sault Ste Marie)
• Bon Soo Winter Carnival (Sault Ste. Marie)
• Cinéfest Sudbury International Film Festival (Sudbury)
• Junction North International Documentary Film Festival (Sudbury)
• Northern Lights Festival Boréal (Sudbury)
• La Nuit sur l'étang (Sudbury)
• Queer North Film Festival (Sudbury)
• Sudbury Outdoor Adventure Reels Film Festival (Sudbury)
• Sudbury Pride (Sudbury)
• Sundridge Sunflower Festival (Sundridge)^[1]
• Up Here Festival (Sudbury)

Northwestern Ontario

• Northwest Film Fest (Thunder Bay)
• Thunder Pride (Thunder Bay)
• Vox Popular Media Arts Festival (Thunder Bay)

Southern Ontario

Ice sculptures in Confederation Park are illuminated nightly.

Shot of the twin stages at the Havelock Country Jamboree in 2005

• Bluesfest International Windsor (Windsor)
• Blyth Festival (Blyth)
• Boots and Hearts Music Festival (Oro-Medonte)
• Brantford Ribfest (Brantford)^[2]
• Bridges Festival (Mississauga)
• Brighton Applefest (Brighton)
• Canada Dance Festival (Ottawa)
• Canada Day
• Canadian Filmmakers' Festival (Toronto)
• Canada's Largest Ribfest (Burlington)
• Canal Days (August Civic Holiday Weekend - Port Colborne)
• Carassauga (May - Mississauga)
• Carnival of Cultures (Ottawa)
• CMT Music Fest (Kitchener)
• Downtown Oakville Jazz Festival (Oakville)
• Elmira Maple Syrup Festival (April - Elmira)
• Festival of Northern Lights (Owen Sound)
• Fergus Scottish Festival and Highland Games (Fergus)
• Friendship Festival (Fort Erie)
• Goderich Celtic Roots Festival (Goderich)
• Havelock Country Jamboree (August - Havelock)
• Heatwave (Bowmanville)
• Home County Folk Festival (London)

Ribfests typically attract large crowds.

• Kitchener-Waterloo Oktoberfest (October - Kitchener)
• London Ontario Live Arts Festival (London)
• London Ribfest (August Civic Holiday Weekend - London)
• Luminato Festival (June - Toronto)
• Mariposa Folk Festival (Orillia)
• MuslimFest (Mississauga)
• North by Northeast / NXNE (Toronto)
• Nuit Blanche (September - Toronto)
• Ontario Pirate Festival (Guelph)^[3]
• Ottawa Bluesfest (Ottawa)
• Ovation Music Festival (Stratford)
• Peterborough Summer Festival of Lights (Peterborough)
• Pride Week (Toronto)
• Puppet Festival Mississauga (March - Mississauga)
• Rockton World's Fair (October Thanksgiving Weekend - Flamborough)
• St. Lawrence Shakespeare Festival (St. Lawrence)
• Toronto Caribbean Carnival - Toronto Carnival (March - August -Toronto)
• Shaw Festival (Niagara-on-the-Lake)
• Steam Era (September Labour Day Weekend - Milton)
• Stratford Shakespeare Festival (Stratford)
• Strawberry Fields Festival (Aug. 1970 - Bowmanville)
• Sunfest (July - London)
• Supercrawl (September - Hamilton)
• Taste of the Kingsway (September - Toronto)
• Taste of the Danforth (August - Toronto)
• The Great India Festival (August - Ottawa)^[4]
• Toronto Chinese Lantern Festival (Toronto)
• Toronto Design Offsite Festival (Toronto)^[5]
• Toronto International Film Festival (Toronto)
• Toronto Reel Asian International Film Festival (Toronto)
• Toronto Ribfest (July Canada Day Weekend - Centennial Park, Etobicoke)
• Wallaceburg Antique Motor Boat Outing (Wallaceburg)
• Waterloo Festival for Animated Cinema (Waterloo)
• WayHome Music & Arts Festival (Oro-Medonte)
• Windsor–Detroit International Freedom Festival (Windsor)
• Winter Festival of Lights (Niagara Falls)
• Winterlude (February - Ottawa)
• The Word on the Street Festival (September - Toronto)