Spraoí Pat Simmonds and Kelly Hood - Toronto Irish music based around pipes and fiddle.
Craig Atkinson Cape Breton style fiddler
Tony McManus celtic guitar madman.
Grit Laskin luthier extraordinaire and musician.
Natalie MacMaster Cape Breton fiddler.
Anne Lederman Fiddler, teacher, musicologist.
Duncan Cameron Multi-instrumentalist, composer, teacher
Patrick Ourceau Fiddler, performer, teacher

Other Celtic music sites

Cranford Publications. Hard-to-find Cape Breton, Scottish and Irish recordings and tune books, and a great selection of abc transcriptions.

Ontario Organization and Venues

Ontario Fiddle and Step-dance Camp (warning - music plays!)
Flying Cloud Folk Club291 Brunswick Ave, downtown Toronto
Hugh's Room - roots music, including Celtic.
Ottawa CCE
Concerts at Paris (Ontario) Plains Church
Toronto Country Dancersrun regular contradances at St Barnabas Church and elsewhere
Riverside Celtic College has lessons and events in the Guelph, Ontario area.
Set dancing events, workshops, links and resources
St Paul's Toronto School of Irish Music

International Organizations

Comhaltas Ceoltoiri Eireann (CCE) Irish Music and Dance.

Special Event Links

Chris Langan Irish Music weekend, every January
Celtic Roots Festival, in Goderich Ontario, every August Algoma Traditional Music and Dance Family Camp (AlgomaTrad) run by Pat O'Gorman and Julie Schryer.