| CISPro Systems, Inc. | British Columbia |
| Cissec Corporation, Inc. | Ontario |
| Cistel Technology, Inc. | Ontario |
| Citadel Commerce Corporation | British Columbia |
| Cité Biotech | |
| Cité Logique Drummond, Inc. | Quebec |
| CitéNet | Quebec |
| CiteRight, Inc. | |
| Citi College | Ontario |
| CITI Consolidated Information Technologies, Inc. | Ontario |
| CitiView | British Columbia |
| Citizen Lab | Ontario |
| CITIZN | |
| CITP, Inc. | Quebec |
| Citrus Sports Software | |
| CitrusStudio | |
| City & District Web Development | New Brunswick |
| City Cloud Canada | |
| City of Mississauga | |
| City of Toronto | |
| City Telecom Toronto | Ontario |
| City Wide Communications, Inc. | Nova Scotia |
| City-Com Communications | Ontario |
| Cityfone Telecommunications, Inc. | British Columbia |
| Cityline Websites | British Columbia |
| Citylitics, Inc. | |
| CityMax, Inc. | British Columbia |
| CityPassenger | Quebec |
| CityPro Communications | Ontario |
| CityScan Technologies, Inc. | |
| CityWest | British Columbia |
| CIUSSS de l'Estrie CHUS | |
| CIVA Communications, Inc. | Ontario |
| Civic Tech | Ontario |
| Civic Tech Fredericton | New Brunswick |
| Civic Tech Toronto | |
| CivilCode Collective | |
| Civilia | |
| CIX Summit | Ontario |
| CJ Technologies | |
| CJamesRun Design | Saskatchewan |
| Cl Innovations, Inc. | Quebec |
| CL Web Developers | |
| Claero Systems | Alberta |
| Clairsoft | Ontario |
| Clapfoot, Inc. | |
| Clara Software | |
| Claremont Communications | Ontario |
| Clarendon Technologies, Inc. | Ontario |
| Claribase | |