Also, check these folks out:

Alpha Art GalleryOttawa Central531 Sussex Dr, Ottawa, ON have merged with The Sussex Contemporary
The Art House CaféOttawa Central555 Somerset Street West, Ottawa ON K1R 5K1
Cube GalleryOttawa Central1285 Wellington W
Ottawa, Ontario
K1Y 3A8
Galerie SAW GalleryOttawa Central67 Nicholas St., Ottawa, Ontario, K1N 7B9
Orange Art GalleryOttawa Central290 City Centre Avenue, Ottawa, ON
The Ottawa Art Gallery | La Galerie d’art d’OttawaOttawa Central50 Mackenzie King Bridge, Ottawa, ON, K1N 0C5, CANADA
Santini GalleryOttawa Central422 1/2 Preston Street
Ottawa, Ontario
The Sussex ContemporaryOttawa Central531 SUSSEX DRIVE
K1N 5S6
http://thesussexcontemporary.com have merged w/ Alpha Art Gallery
Koyman GalleriesOttawa East1771 St. Laurent Blvd. Ottawa ON, Canada K1G 3V4
Shenkman Arts CentreOttawa East245 Centrum Blvd, Orléans, ON K1E 0A1
Carleton University Art GalleryOttawa West1125 Colonel By Drive
Ottawa, Ontario
K1S 5B6
http://cuag.ca Patrick’s Building, Carleton University
Foyer GalleryOttawa West1701 Woodroffe Avenue
Ottawa, Ontario
K2G 1W2
http://foyergallery.com Sportsplex (Entrance #1)
Gallery 101Ottawa West280 Catherine Street
Ottawa K1R 5T3
Patrick Mikhail GalleryOttawa West2401 Bank St., Ottawa, ON, K1V 8R9http://www.patrickmikhailgallery.com
Wall Space Gallery & FramingOttawa West358 Richmond Road
Ottawa, ON K2A OE8
http://www.wallspacegallery.ca parking at the back with access to the gallery, off of Danforth Avenue between Churchill and Roosevelt.
(TBD)Ottawa South
Art FactoryRenfrew286 Hinchey Ave. Ottawa, Ontario
Karsh-Masson Gallery(TBD)110 Laurier Avenue West, Ottawa, ON
Possible WorldsOttawa Central708G Somerset St. W, Ottawa K1R 6P6 Floor
Manotick Art Gallery and FramingManotick5517 Main st., Manotick, ON, K4M 1A5
National Gallery of CanadaOttawa Central380 Sussex Drive, Ottawa, ON
Da Artisti Studio & GalleryCumberland2565 Old Montreal Rd, Ottawa, Ontario
Loretta Studios and GalleryOttawa Central131 Loretta Avenue North
Ottawa, Ontario
Central Art GarageOttawa West66 B LeBreton St. North, Ottawa, ON, K1R 7H4 garage
Gigspace Art GalleryOttawa Central953 Gladstone Avenue, Ottawa, K1Y 3E5​