| Unit Name: | 42 Radar Squadron |
| Dates: | June 1955–present |
| Country: | Canada |
| Branch: | Royal Canadian Air Force |
| Type: | Tactical fighter control |
| Size: | Squadron |
| Command Structure: | 4 Wing Cold Lake |
| Garrison: | CFB Cold Lake |
| Motto: | la|Dirigenti manu|with a guiding hand |
| Equipment: | AN/TPS-70 Radar system |
42 Radar Squadron (French: French: 42<sup>e</sup> Escadron de radar) is a unit of the Canadian Forces under the Royal Canadian Air Force. The squadron operates the AN/TPS-70 radar system from CFB Cold Lake in Alberta, Canada.
42 Aircraft Control and Warning (AC&W) Squadron of the Royal Canadian Air Force became operational in June 1955. The squadron was originally tasked with providing radar control to the CF-100s flying in the vicinity of RCAF Station Cold Lake. In October 1962, 42 AC&W Squadron as 42 Radar Squadron in the Semi-Automated Ground Environment (SAGE) system, as part of the 28th NORAD Region.[1]