Aylmer is a former city of Quebec that on January 1, 2002 became a western sector of Gatineau, Canada. It is located on the Ottawa River and Route 148. Population (2006): 41 882 — approx. 16% of Gatineau. It is named after Lord Aylmer, who was a Governor General of British North America and a Lieutenant Governor of Lower Canada from 1830 to 1835. It remains primarily a suburb of Ottawa.

It bills itself as the "Recreation Capital of the National Capital", given its many golf courses, green spaces, spas, marina and bicycle paths. There is little industry in the sector, the area being mainly residential. Virtually all the major shops, services and restaurants are located along Chemin d'Aylmer. The sector's indoor swimming pool and skateboard park are also located on that road.