Answer : There are several schools in Ottawa that offer interior design programs. The most reputable and well-known programs are likely to be found at the private career colleges, such as Algonquin College, Canadian Trucking and Transport Training Institute, and La Cité collégiale. These private institutions typically have smaller class sizes, longer duration programs, and more experienced instructors which may result in a more intensive learning experience overall. However, they also tend to cost more than public institutions.
Alternatively, you could consider studying interior design at one of Ottawa's public institutions such as Carleton University or the University of Ottawa.