William Sellars (5 June 1925 – 19 December 2018) was an English television producer and director, most active from the 1960s to the 1980s. His entire 33-year-career was spent working on projects for the BBC. Of these, All Creatures Great and Small (1978–90), which he produced for its entire run, was the biggest success. Conversely, he had a major critical failure with Triangle (1981–83), a soap opera set on board a ferry in the North Sea.