Twelve teams qualified for the 2023 Ontario Tankard. Two teams qualified via their results in the "
Grand Slam" series events (
2022 PointsBet Invitational,
2022 National,
2022 Tour Challenge,
2022 Masters). Two teams qualified via their results in the Trillium Tour '1000' series events (
Stu Sells Toronto Tankard,
Capital Curling Classic,
Stroud Sleeman Cash Spiel,
Tour Challenge Tier 2,
Stu Sells Brantford Nissan Classic). Three teams qualified via their results in the Trillium Tour '500' series events (
Gord Carroll Curling Classic,
KW Fall Classic,
Capital Curling Fall Open, St. Thomas Curling Classic,
Comco Cash Spiel,
Stu Sells Port Elgin Superspiel, Capital Curling Rideau Open,
Stu Sells Cookstown Classic, plus the aforementioned 1000 events). One team (restricted to curlers under the age of 25) qualified via their results in the aforementioned Trillium Tour events, plus the CurlON 250 Event #1. The remaining four teams qualified via an open qualifier. {{Location map+ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario {{Location map~ | Canada Southern Ontario ==Teams==