This article lists all of the numbered regional roads in the Regional Municipality of Halton, Ontario, Canada.
| Number | Names | Western/Southern Terminus | Eastern/Northern Terminus | Major Communities | Comments |
|---|---|---|---|---|---|
 | Guelph Line | Interchange with Queen Elizabeth Way/Highway 403 (QEW Exit 102) | Eramosa-Milton Townline (boundary with Wellington County, Ontario, continues as Wellington County Road 44 - 4th Line Concession) | Burlington, Milton, Campbellville | Passes by the Mohawk Raceway |
 | Trafalgar Road | Speers Road | Intersection with Erin-Halton Hills Townline, Wellington CR 24, and Wellington County Road 42 (32nd SideRoad, boundary with Wellington County, continues as Wellington County Road 24). | Oakville, Hornby, Georgetown | Very busy road which serves as the primary north-south artery of Oakville, and connects Oakville with Georgetown via Halton Hills. Has a 4 km break northwest of Georgetown as Highway 7 is channelled along its baseline, and continues south of Speers Road to Lakeshore Road under the jurisdiction of the Town of Oakville. |
 | Neyagawa Boulevard, James Snow Parkway | Halton Regional Road 38 (Upper Middle Road) | West of Halton Regional Road 25 | Milton, Oakville | Currently short, but extensions are planned, and the northern extension is already under construction. Named for former provincial cabinet minister James Snow. |
 | Dundas Street | Evans Road (boundary with the City of Hamilton; continues as Hamilton City Road 5) | 9th Line (boundary with the Regional Municipality of Peel; Dundas continues unnumbered into Mississauga) | Burlington, Oakville | Major artery in the southern part of Halton RM, quite busy at times. |
 | Britannia Road | Halton Regional Road 22 (Tremaine Road) | 9th Line (boundary with Peel RM, continues as Peel Regional Road 3) | Milton | Originally Number 5 Sideroad until 1966. [1] |
 | Derry Road | Milburough Line (boundary with the City of Hamilton) | 9th Line (boundary with Peel RM, continues as Peel Regional Road 5) | Kilbride, Milton | Originally Number 10 Sideroad until 1966. [1] |
 | Steeles Avenue | Halton Regional Road 22 (Tremaine Road) | Winston Churchill Boulevard (Halton RR 25/Peel Regional Road 19, boundary with Peel RM, continues as Peel Regional Road 15) | Milton | Brief concurrency with RR 25. Continuation of street from Peel and Toronto. Known as Upper Base Line until 1966. [1] |
 | Campbellville Road | Milburough Line (boundary with City of Hamilton, continues as Hamilton CR 518) | Halton Regional Road 1 (Guelph Line) | Milton (Campbellville) | |
 | 10th Sideroad | Halton Regional Road 3 (Trafalgar Road) | Halton RR 25/Peel RR 19 | Georgetown, Norval | Passes along the southern edge of Georgetown before merging with RR25 on the west end of Norval. |
 | Maple Avenue | Halton Regional Road 3 (Trafalgar Road) | Ninth Line | Georgetown | Passes through Georgetown's downtown and central business district |
 | Mountainview Road, 9th Line, Ford Drive | Halton Regional Road 8 (Steeles Avenue), Speers Road | Halton Regional Road 10 (10th Sideroad) | Oakville, Halton Hills | One of the main roads into Georgetown, discontinuous between Dundas St. (RR#5) and Highway 401, where Ninth Line is maintained by the City of Mississauga; has a jog at Steeles Ave. (RR#8) |
 | Dorval Drive | Lakeshore Road | Halton Regional Road 38 (Upper Middle Road) | Oakville | |
 | Brant Street | Interchange with QEW | Halton Regional Road 5 (Dundas Street) | Burlington | Named for Joseph Brant. |
19  Peel shields used only | Winston Churchill Boulevard, Adamson Street, King Street | Lakeshore Road in Oakville | Intersection with Wellington CR 42 (Boundary with Wellington County, continues as Peel RR 19/Wellington CR 25) | Terra Cotta, Norval, Georgetown, Oakville | Shared regional road with Peel Region, but signed as Peel RR19 only. Named after Sir Winston Churchill, former British Prime Minister during the Second World War. Acts as the boundary between Peel RM and Halton RM. Discontinuous from Steeles Avenue (RR 8) to Dundas Street (RR 5), as the Region line moves west and the road is fully in Peel RM (Mississauga). Known as East Town Line until 1966. [1] |
 | Appleby Line | Interchange with Queen Elizabeth Way | Halton Regional Road 7 (Derry Road) | Burlington | |
 | Burloak Drive, Upper Middle Road | Interchange with QEW | Halton Regional Road 20 (Appleby Line) | Oakville, Burlington | Burloak and Tremaine were formerly known as West Town Line before 1967. [1] |
 | Tremaine Road | Halton Regional Road 5 | 5th Sideroad | Milton, Milton Heights | Intersection at Steeles being re-routed with traffic circle further west. Burloak and Tremaine were formerly known as West Town Line before 1967. [1] Current Tremaine Road overpass will be re-located to the east with an interchange and to align with re-routing of road south of the 401 along with the closure of Peru Road north of the 3rd Side Road (and future re-alignment of Dublin Line north of 401). [2] |
 | Milburough Line | Halton Regional Road 7 (Derry Road) | Kilbride | ||
 | Bronte Road, Ontario Street, Steeles Avenue, Martin Street, Main Street | Speers Road | Erin-Halton Hills Townline (boundary with Wellington County, continues as Wellington County Road 125) | Burlington, Milton, Milton Heights, Acton | Formerly Highway 25. Has a brief concurrency with RR 8. Note: Peel Regional Road 19 is also signed as Halton RR 25 on maps from the Region boundary to Terra Cotta (roughly 5 km). |
 | Burnhamthorpe Road | Halton Regional Road 25 | Halton Regional Road 13 | Oakville | Continuation of street from Mississauga. It was previously called Back Concession Road in the former Halton County before 1967. [1] Now mostly bypassed by RR40 (William Halton Parkway). |
 | 32nd Sideroad | Fourth Line | Boundary with Wellington County | ||
 | 20th Sideroad | Concession 11 (boundary with Wellington County, continues as Wellington County Road 34) | Halton Regional Road 1 (Guelph Line) | Continuation of Wellington County Road 34 | |
 | Upper Middle Road | Brant Street | Peel Regional Road 19 (Winston Churchill Boulevard) | Burlington, Oakville | |
 | William Halton Parkway | Halton Regional Road 25 (Bronte Road) | Ninth Line | Oakville | Partial bypass of RR 27 (Burnhamthorpe Road), with extension planned. Opened November 2020. [3] |
 | Wyecroft Road (West) | Burloak Drive | RioCan Burloak (planned extension to Bronte Road) | Burlington, Oakville (planned) | Construction on extension and bridge to Bronte Rd. started in 2019 and is planned to be completed in 2026. [4] |
