W5 is a Canadian news magazine television series produced by CTV News. The program is currently initially broadcast Saturday nights at 7 p.m. on CTV, with repeat broadcasts at later times on CTV as well as co-owned channels CTV Two, CP24, and Investigation Discovery.

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

W5 is the longest-running current affairs/newsmagazine program in North America and the third longest-running Canadian television program.

It was launched as W5 in 1966 just after the demise of CBC Television's This Hour Has Seven Days, at a time when the CTV network was on the brink of bankruptcy. The program's magazine format is considered an inspiration for a number of similar programs, including the American series 60 Minutes which premiered two years later.^{[citation needed]}

The program's first executive producer was Peter Reilly, who later went on to become first host of the CBC's later current affairs offering, The Fifth Estate. Peter Rehak was executive producer through the 1980s and 1990s.