The following institutions recently joined or renewed their membership with the Ontario Museum Association. Welcome, and welcome back to:
| 48th Highlanders Museum |
| Adelaide Hunter Hoodless Homestead National Historic Site |
| Art Gallery of Mississauga |
| Aurora Historical Society |
| Backus-Page House |
| Ball's Falls Conservation Area |
| Banting House National Historic Site |
| Beachville District Historical Society Museum |
| Black Creek Pioneer Village |
| Brockville Museum |
| Cambridge Sports Hall of Fame |
| Canadian Air & Space Museum |
| Canadian Military Heritage Museum |
| Centennial Museum of Sheguiandah |
| CFB Petawawa Military Museum & Canadian Airborne Forces Museum |
| Chatham Kent's Municipal Museums |
| City of Hamilton Civic Museums |
| Cloyne and District Historical Society |
| CNE Archives |
| Comber and District Historical Society Museum |
| Cottonwood Mansion Museum |
| Council of Heritage Organizations in Ottawa / Conseil des organismes du patrimoine d'Ottawa |
| Dance Collection Danse |
| Delhi Tobacco Museum & Heritage Centre, The |
| Dionne Quints Museum |
| Drumbo and District Heritage Society |
| Dundas Historical Society Museum |
| Elgin Military Museum |
| Elman W. Campbell Museum |
| Friends of the CAMH Archives |
| Haldimand County Museum & Archives |
| Heritage Schoolhouse Museum (York Region District School Board) |
| Huron County Museum and Historic Gaol |
| Magnetawan Heritage Centre |
| Museum and Archives - Toronto District School Board |
| Museums of Mississauga |
| Oil Museum of Canada |
| Omamiwinini Pimadjwowin |
| Parks Canada, Ontario Service Centre |
| Peterborough Museum and Archives |
| Sault Ste. Marie Museum |
| Sioux Lookout Museum |
| Station Gallery |
| Textile Museum of Canada |
| Thames Valley Museum School |
| The Canadian Clock Museum |
| Thunder Bay Museum |
| Upper Canada Village |
| Wilmot Heritage Fire Brigades |
| Woodland Cultural Centre |