W5 is a Canadian news magazine television program that was produced by CTV News. The program was broadcast on CTV, with repeat broadcasts on CTV 2, CTV News Channel, and Investigation Discovery. The program also aired in a radio simulcast on CFRB in Toronto.

The title refers to the Five Ws of journalism: Who, What, Where, When and Why? It was the longest-running news magazine/documentary program in North America and the most-watched program of its type in Canada.

In February 2024, Bell Media announced that W5 would conclude as a regular television series after 58 seasons, due to cutbacks at the company; in September 2024, CTV News would relaunch the brand as an investigative journalism unit, which will present long-form stories on the CTV National News and other CTV News platforms, and produce occasional documentary specials for CTV under the branding W5: Avery Haines Investigates.