James Edward Carter (born 19 August 1948) is an English actor. He is best known for his role as Mr Carson in the ITV historical drama series Downton Abbey (2010–2015), which earned him four nominations for the Primetime Emmy Award for Outstanding Supporting Actor in a Drama Series (2012–2015). He reprised the role in the feature films Downton Abbey (2019) and Downton Abbey: A New Era (2022).

Carter's films include A Private Function (1984), The Company of Wolves (1984), A Month in the Country (1987), The Witches (1990), A Dangerous Man: Lawrence After Arabia (1992), Stalin (1992), The Madness of King George (1994), Richard III (1995), Brassed Off (1996), Shakespeare in Love (1998), The Little Vampire (2000), Ella Enchanted (2004), The Thief Lord (2006), The Golden Compass (2007), Tim Burton's Alice in Wonderland (2010), My Week with Marilyn (2011), Transformers: The Last Knight (2017), The Good Liar (2019), and Wonka (2023).

Carter's television credits include Lipstick on Your Collar (1993), Cracker (1994), The Way We Live Now (2001), The Singing Detective (1986), Minder (1994), Arabian Nights (2000), The Chest (1997), Red Riding (2009), A Very British Coup (1988), the Hornblower episode "Duty" (2003) and the Midsomer Murders episode "The Fisher King" (2004), and Dinotopia (2002). He also played Captain Brown in the five-part BBC series Cranford (2007) alongside his wife, Imelda Staunton.