Aberdeen Avenue is a Lower City arterial road in Hamilton, Ontario, Canada. It starts off just West of Longwood Road South and East of Highway 403 as a two-way thoroughfare up to Queen Street South where it then switches over to a one-way collector road (Eastbound) to Bay Street South and then to another two-way section from Bay Street to James Mountain Road, a mountain-access road in the city near the base of the Niagara Escarpment (mountain).
Aberdeen Avenue, was named after Lord Aberdeen (John Hamilton-Gordon, 1st Marquess of Aberdeen and Temair) and Lady Aberdeen (Ishbel Hamilton-Gordon, Marchioness of Aberdeen and Temair) who both lived in Hamilton on Bay Street South (1890-1898) with their four children. They presided over the opening of the Hamilton Public Library on September 16, 1890. Lord Aberdeen was appointed Governor General of Canada in 1893.
Historically, the Durand neighbourhood along Markland Street and Aberdeen Avenue, east of Queen Street, was home to the 'industrialists'. This south of downtown neighbourhood is quite possibly the largest concentration of early 20th-century castles/mansions in Canada. The grand homes were home to the families whose names graced the signs of the north end factories and made their fortunes in transportation, finance and industry.
A massive McMaster University research campus called McMaster Innovation Park is currently being developed on the former Camco lands near Westdale. This will be an "idea factory" employing scientists and technicians. CANMET will employ 100 research scientists and support workers, including some of the top minds in Canada and will be the anchor tenant of the facility. They will be working closely with McMaster researchers and private industry to develop technologies for metal and materials manufacturing, processing and evaluation. Expected to be up-and-running by 2010. Other tenants already announced for the park include a corrosion research centre sponsored by General Motors and a diesel engine research lab sponsored by Ford.
Note: Listing of Landmarks from West to East.
- Highway 403, (Chedoke Expressway)
- McMaster Innovation Park, former site of the Camco plant
- Empty and boarded up Industrial warehouse/factory complex
- Canadian Pacific Railway bridge, (formerly known as the TH & B Railway bridge
- Chedoke Civic Golf & Ski Club
- Aberdeen Court, (7-storey apartment building)
- Durand neighbourhood 20c castles/ mansions
- St. Boniface German Roman Catholic Church
- Beth Jacob Synagogue
- Beth Jacob Hebrew School
- Locke Street Shopping District
- Aberdeen Apartments, (4-storey apartment complex)
- James Street Stairway (Mountain-access)
- Bruce Trail
- Niagara Escarpment (mountain)
The Aberdeen Avenue bridge which was constructed in 1963, was found to have advanced deterioration including on the deck, bridge containment, and non-performing bearings by the Ministry of Transportation of Ontario (MTO). The MTO decided to go with a rapid bridge replacement process, replacing the entire Aberdeen Avenue bridge deck in a weekend instead of taking the usual nine to twelve months to complete it. Reasons for the decision included minimizing disruptions to the travelling public, improved construction safety and reduced construction costs.
MTO retained the engineering and management firm Morrison Hershfield as lead consultant for this exciting and innovative project. The rapid bridge replacement process began the evening of July 30, 2010. Using innovative technology the old bridge was lifted away and replaced with a pre-constructed bridge that was built nearby. The process was completed on August 3, 2010. Dufferin Construction Company successfully executed the complete replacement.
This project was the first time rapid replacement technology has been used over a major highway in Southern Ontario. It is also part of a larger project to repair or replace eight bridges along Highway 403 in Hamilton. This $35.8 million investment is expected to create or sustain approximately 415 jobs as part of the Ontario Open plan.
On February 26, 2011, the Hamilton/Halton Engineering Week committee selected the Ontario Ministry of Transportation, Morrison Hershfield and Dufferin Construction team as the recipients of the 2011 Project of the Year in the Civil Engineering category for the Highway 403/ Aberdeen Avenue Rapid Bridge Replacement.
Note: Listing of neighbourhoods from West to East. 
- Kirkendall North/ Chedoke Park B, Aberdeen Avenue cuts through these two neighbourhoods.
- Kirkendall North/ Kirkendall South, Aberdeen Avenue cuts through these two neighbourhoods.
Roads that are parallel with Aberdeen Avenue
Lower City Roads:
- Burlington Street, West/East
- Barton Street, West/East
- Cannon Street, West/East
- Wilson Street
- King William Street
- King Street, West/East
- Main Street, West/East - Queenston Road
- Jackson Street, West/East
- Hunter Street, West/East
- Augusta Street
- Charlton Avenue, West/East
- Aberdeen Avenue
Niagara Escarpment (Mountain) Roads:
- Concession Street
- Queensdale Avenue West/ East
- Scenic Drive - Fennell Avenue, West/East
- Sanatorium Road
- Mohawk Road, West/East
- Limeridge Road West/East
- Lincoln M. Alexander Parkway - Mud Street, (Hamilton City Road 11)
- Stone Church Road, West/East
- ; Rymal Road, West/East
- Twenty Road
Roads that cross Aberdeen Avenue
Note: Listing of streets from West to East.
- Longwood Road, South
- Dundurn Street, South
- Locke Street, South
- Queen Street, South
- Hess Street, South
- Bay Street, South
- James Street, South
- Houghton, Margaret (2002). Hamilton Street Names: An Illustrated Guide. James Lorimer & Co. Ltd. ISBN 1-55028-773-7.
- Manson, Bill (2003). Footsteps In Time: Exploring Hamilton's heritage neighbourhoods. North Shore Publishing Inc. ISBN 1-896899-22-6.
- "McMaster Innovation Park information". McMaster University. Archived from the original on 20 December 2007. Retrieved 2007-12-07.
- "Innovation Park out to attract Ottawa scientists". Hamilton Spectator. 2007-06-07.
- "MTO Rehabilitating Bridges Along Highway 403". Hamilton Mountain News. Retrieved 2010-08-31.
- "Aberdeen Bridge Replaced Over 3 Days". Ontario.ca Newsroom. Archived from the original on 15 August 2010. Retrieved 2010-08-31.
- "Dufferin Construction replaces entire overpass in 51 hours". Newswire.ca. Retrieved 2010-09-01.
- "Project of the Year Award for the Highway 403/Aberdeen Avenue Rapid Bridge Replacement". Morrison Hershfield. Retrieved 2011-03-01.
- "Hamilton Neighbourhood Boundaries, (map.hamilton.ca)" (PDF). Archived from the original (PDF) on 2007-09-27. Retrieved 2007-05-11.
- MapArt Golden Horseshoe Atlas - Page 647 - Grids H9, H10, H11, H12
- Durand Neighbourhood
- Kirkendall Neighbourhood
- Locke Street.com
- Locke Street South Shopping District
- Bruce Trail Association
- Hikes on the Bruce Trail
- Morrison Hershfield - Rapid Bridge Replacement Project Page
- Dufferin Construction web site
- Google Maps: Aberdeen Avenue (Hybrid)