William Tulloch Paterson (born 3 June 1945) is a Scottish actor. Throughout his career he has appeared regularly in radio drama and provided the narration for a large number of documentaries. Paterson has appeared in films and television series including Comfort and Joy (1984), Traffik (1989), Auf Wiedersehen, Pet (1986), Truly, Madly, Deeply (1990), The Witches (1990), Wives and Daughters (1999), Sea of Souls (2004–2007), Amazing Grace (2006), Miss Potter (2006), Little Dorrit (2008), Doctor Who (2010), Outlander (2014), Fleabag (2016–2019), Inside No. 9 (2018), Good Omens (2019), Brassic (2020) and House of the Dragon (2022). He is a recipient of the Lifetime Achievement Award of the Scottish BAFTAs.

William Tulloch Paterson was born in Glasgow on 3 June 1945. Paterson was raised in Dennistoun by his father, a plumber, and his mother, a hairdresser. He states that his interest in acting began with a school trip to the Citizens Theatre in the Gorbals in 1961. However, after school he chose to initially pursue a career based on an interest in architecture and spent three years as a quantity surveyor's apprentice before deciding to attend the Royal Scottish Academy of Music and Drama