- Active Citizenship (Plain-Language Summary)
- Acton Vale
- ACTRA
- Acts and Treaties
- Ada Bronstein
- Ada Kent
- Ada Mackenzie
- Adam Nayman
- Adam Beach
- Adam Beck and the Creation of Ontario Hydro
- Adam Dollard des Ormeaux
- Adam Faithfull
- Adam Francis
- Adam G. Fuerstenberg
- Adam Gaudry
- Adam Gopnik
- Adam Hartley Zimmerman
- Adam Jones
- Adam Muir
- Adam P. Woog