Seaway is a Canadian drama series that aired on CBC Television for the 1965–1966 season. The series was a Seaway Films production in collaboration with the UK's ATV, with production money provided by the CBC. It was presented by ASP and distributed internationally by ITC Entertainment (for international screenings ITC replaced the theme music by John Bath with another composition by Edwin Astley, and prepared a different title sequence).

Although officially Canadian, many of the show's writers and directors were American (as was the series creator/script supervisor Abraham Polonsky), with some British contributors as well (such as Ian McLellan Hunter and Donald James). It was the most expensive series produced in Canada to that time with a total cost of $3 million ($12.9 million today), and although it did well enough for the CBC in terms of viewers, a hoped-for sale to American network television never happened because the series was shot in black-and-white, and U.S. network shows by that time were increasingly being made in color (with fewer and fewer exceptions). Only the two final two-part episodes of Seaway, "Don't Forget to Wipe the Blood Off" and "Gunpowder and Paint," were filmed in color.