George Murray (played by Jonathan Coy)
The Earl of Grantham’s lawyer who finds Matthew Crawley as the new heir after James and Patrick Crawley’s deaths. Unsuccessfully defends Bates against murder charges.
Joseph Molesley (played by Kevin Doyle)
Valet to Matthew Crawley and butler to him and his mother Isobel at Crawley House in Downton village. Escapes war service by lying about his health.
Mrs. Bird (played by Christine Lohr)
Cook at Crawley House, temporary substitute for Mrs.Patmore at Downton during her eye problems. Runs a soup kitchen for veterans during the war.
Dr. Richard Clarkson (played by David Robb)
Doctor to Downton village and the Crawley family. Works at Downton when it becomes a hospital with the rank of Major.
John Drake (played by Fergus O’Donnell)
Local farmer whose life is saved by Isobel Crawley’s insistence that he has a new medical procedure. Kisses Lady Edith when she works on his farm during the war, which makes his wife insist Edith be removed from her position.
Mrs. Drake (played by Cathy Sara)
As above, wife of John Drake who witnesses his kissing Edith and so forces her to leave their farm, replacing her with a man.
Taylor (played by Lionel Guyett)
Downton Abbey chauffeur, who leaves to run a teashop.
Tom Branson (played by Allen Leech)
Replacement chauffeur. Socialist firebrand who only stays in his post due to his love for Lady Sybil. Finally, he marries her and moves to Dublin to follow a career as a journalist. He returns to Downton following troubles due to his republican activities, and finally accepts a position as manager of the estate.
Evelyn Napier (played by Brendan Patricks)
Friend of the Crawley family who is a suitor for Mary, but gives up when he realizes she thinks him dull. Introduces Kemal Pamuk to Downton.
Kemal Pamuk (played by Theo James)
Dashing Turkish diplomat who visits Downton and is instantly attracted to Lady Mary. He visits her room late one night and has sex with her, but dies in her bed the same night.
Duke of Crowborough (played by Charlie Cox)
Family friend of the Crawleys who intended to ask Mary to marry him but backs out when he realizes there is no chance of her inheriting Downton. Had a homosexual affair with Thomas but managed to thwart his blackmail attempts.
Lynch (played by Andrew Westfield)
Downton Abbey groom whose duties include escorting Lady Mary when she goes riding.
Charles Grigg (played by Nicky Henson)
Former partner of Carson in a music hall act, information which he uses to blackmail Carson into protecting him when on the run from petty theft charges. Paid off by the Earl and warned never to return.
Joe Burns (played by Bill Fellows)
A farmer who was rejected as a suitor by Mrs.Hughes in favor of her career. After being widowed, he again asked her to marry him but was again turned down, despite being a good man.
Sir Anthony Strallan (played by Robert Bathurst)
Local landowner who intended to propose to Edith, but was tricked out of it by Mary (taking revenge for Edith’s rumor mongering). Wounded in WWI. Eventually proposes to Edith but then leaves her at the altar, feeling she should marry a younger man.
Lady Rosamund Painswick (played by Samantha Bond)
Nee Crawley, the daughter of the Dowager Countess and widow of a wealthy banker. Lives alone in London. Was engaged to Lord Hepworth until she discovered his affair with her maid.
Lavinia Catherine Swire (played by Zoe Boyle)
Daughter of a London solicitor and fiancée of Matthew Crawley. Remained devoted to Matthew even when he thought he was paralyzed and impotent and told her to forget him. Died of Spanish influenza in 1919.
Henry Lang (played by Cal Macaninch)
Earl of Grantham’s valet, replacement for John Bates when Bates had to leave due to his wife’s blackmail. Dismissed when his shellshock from the war made it impossible for him to carry out his duties competently.
Jane Moorsum (played by Clare Calbraith)
A war widow with a twelve year old son who gets work as a housemaid at Downton. Has a brief relationship with the Earl which only amounts to a few kisses but is enough to make her leave. The Earl promises to help her son and gets him a scholarship to Ripon Grammar School.
Sir Richard Carlisle (played by Ian Glen)
Newspaper magnate who becomes engaged to Lady Mary. When she has doubts about their marriage he blackmails her into (almost) going through with it due to his knowledge of the Pamuk affair, which he helps her cover up.
Vera Bates (played by Maria Doyle Kennedy)
Wife of John Bates, separated but not divorced. Persistently tries to blackmail Bates after accidentally discovering about the Pamuk affair. Apparently commits suicide though Bates is jailed for her murder.
Edward Courtenay (played by Lachlan Nieboer)
Lieutenant blinded by mustard gas and sent to Downton for treatment. Depressed and kills himself after being told that he must leave Downton for convalescence elsewhere, leaving Sybil and Thomas with whom he has become friendly.
Charles Bryant (played by Daniel Pirrie)
Army Major sent to Downton to convalesce after being wounded. Has an affair with Ethel Parks and gets her pregnant but refuses to see her or his baby son. Returns to the Italian front and is killed.
Patrick Gordon (played by Trevor White)
A Canadian Major, who asks to be sent to Downton after being unrecognizably burnt in the war. Claims to be the heir to Downton, Patrick Crawley, who developed amnesia after the Titanic disaster.He disappears when it seems he is on the verge of being unmasked as a fraud.
Mr. Mason (played by Paul Copley)
Father of William Mason. Delays William’s entry into WWI by ordering him not to enlist, which causes people to accuse William of cowardice.
Mr. Bryant (played by Kevin McNally)
Father of Major Bryant, Ethel Parks’ lover. Initially accuses Ethel of making up the affair and lying about her baby’s paternity, but later offers to adopt his grandson.
Mrs. Daphne Bryant (played by Christine Mackie)
Wife of Mr.Bryant, mother of Major Bryant. More sympathetic than Mr.Bryant but follows his orders.
Marigold Shore (played by Sharon Small)
Maid to Lady Rosamund, dismissed when found having an affair with Lord Hepworth.
Lord “Jinx” Hepworth (played by Nigel Havers)
Impoverished aristocrat who becomes engaged to Lady Rosamund to try and marry his way out of debt. The engagement is broken when he is caught in flagrante with her maid.
Sir Philip Tapsell (played by Tim Piggott-Smith)
Harley Street obstetrician brought in to see Sybil Branson at the request of Lord Grantham. Refuses to accept Dr Clarkson's diagnosis that Sybil has toxemia and so contributes to her death.
Kieran Branson (played by Rauiri Conaghan)
Drunkard brother of Branson who visits Downton for Sybil Branson Jnr's christening. A "rough diamond", at first he spurns the aristocratic family but ends up making a surprisingly good impression on them.
Michael Gregson (played by Charles Edwards)
Wealthy newspaper proprietor who gives Edith a column. He makes it clear that he is attracted to her but it transpires that he has a wife in a lunatic asylum whom he cannot divorce.