OSCA committees are the heart of the community association; it is through the efforts of volunteer committee members that most of what OSCA does is possible. Each committee is chaired by one or two people who also serve on the OSCA Board. Participation in any OSCA committee is open to all residents of Old Ottawa South, and committee meetings are open to the public.
The 2011-2012 list of committees and chairs is shown below.
| Committee | Chair |
|---|---|
| ECOS | Mike Lascelles |
| Finance | Steve Mennill |
| Membership | David Law |
| Nomination |
Greg Strahl |
| OSWatch | Brendan McCoy/Graham Deline |
| Program | Anna Sundin |
| Special Events | Lisa Drouillard/Kendall McQueen |
| Website | Gwendolyn Gall |