Aylmer is a former city of Quebec that in 2002 became a western sector of Gatineau, Canada. It is located on the Ottawa River and Quebec 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 Hull and Ottawa.

It bills itself 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 a residential area. Virtually, all the major shops, services and restaurants are located along Chemin d'Aylmer. The sector's newly-opened swimming pool is also located on that road.

Aylmer's population is about 40% anglophone and 60% francophone; much of its workforce commutes across the river to Ottawa. As such it tends to be a very federalist area, with much of the population being bilingual.

Prior to the merger, Aylmer's residents and municipal laws had strongly opposed extensive construction programs. Following the amalgamation, many of the sector's prized green spaces were cut down for residential construction.

Ex-Aylmer neighbourhoods like Wychwood and Village Lucerne have seen their cherished wilderness sold to contractors. As a result of this unchecked development, there is a strong resentment of the current municipal administration among Aylmer Sector citizens.