| Name | Book/story/stage title | Notes
|
| Jack | Mike and Psmith | Boot-boy at 'The White Boar'
|
| Jackson | An Afternoon Dip | Boy at Locksley school
|
| Jackson of Spence's | | Boy at Wrykyn College
|
| Jackson, Bob | Mike at Wrykyn | Boy at Wrykyn College, brother of Mike Jackson
|
| Jackson, Ella | Mike at Wrykyn | Sister of Mike Jackson
|
| Jackson, Gladys | Mike at Wrykyn | Sister of Mike Jackson
|
| Jackson, Joe | Mike at Wrykyn | Brother of Mike Jackson
|
| Jackson, Marjory | | Outspoken sister of Mike Jackson
|
| Jackson, Mike | | Boy and man, a cricketer
|
| Jackson, Mr | | Father of Mike and other Jackson's
|
| Jackson, Mrs | Mike at Wrykyn | Mother of Mike and other Jackson's
|
| Jackson, Phyllis | | Mike's wife
|
| Jackson, Phyllis | Mike at Wrykyn | Sister of Mike Jackson
|
| Jackson, W. P. | | Boy at Wrykyn College
|
| Jakes, Samuel | Psmith in the City | Messenger at the New Asiatic Bank
|
| James | Egbert, Bull-Frog | A frog owner in India
|
| James | The Sluggard | A very lucky man
|
| James | | Captain of the Weary Willies
|
| Jane | The Crime Wave at Blandings | Niece of Lord Emsworth and daughter of Lady Charlotte
|
| Jane | Jill the Reckless | Jill Mariner's parlour maid
|
| Jane | Without the Option | Professor Pringle's aunt
|
| Jane | Money for Nothing | The Wyvern's maid
|
| Jane | The Story of Cedric | The Watlings' maid
|
| Jane | Uncle Dynamite | Parlourmaid at Ashenden Manor
|
| Jansen | Oh, Kay! | A Revenue Officer
|
| Jardine, Hank | The Coming of Bill | Prospector, offers job to his friend Kirk Winfield
|
| Jarvis, Bat | | A gang leader, fond of birds and cats
|
| Jeeves | | Valet to Bertie Wooster whom he gets out of trouble frequently
|
| Jefferson | French Leave | The Comte d'Estragon
|
| Jellaby, Sir Leopold | Anselm gets his Chance | Squire of Rising Mattock and stamp collector
|
| Jellaby, Myrtle | Anselm gets his Chance | Sir Leopold's niece
|
| Jellicoe, T. J. | Stone and the Weed | Boy at Sedleigh School
|
| Jellife, Walter | Bill the Bloodhound | Leading actor with The Girl from Brighton Company
|
| Jennings, Myra | Fate | A damsel in distress
|
| Jephson, Mr | | House master at Beckford College
|
| Jerningham, Rev. Aubrey | Sam the Sudden | Vicar of Valley Fields, author of Is there a Hell?
|
| Jervis | A Benefit Match | Cricketer and political agent
|
| Jessop, Superintendent Ernest | Do Butlers Burgle Banks? | Of the Wellingford police
|
| Jevons | The Gold Bat | Boy at Ripton College
|
| Jevons | Creatures of Impulse | Valet to Sir Godfrey Tanner
|
| Jim | Back to the Garage | Manager of a number-two company
|
| Jimmy | A Man of Means | An office boy
|
| Jimmy | How's That, Umpire? | A cricket fan at Lord's
|
| Jipson, Catherine | Unpleasantness at Kosy Kot | A children's nurse
|
| Jobson, Bella Mae | The Editor Regrets | Author of children's stories
|
| Jobson, George | The Dastardly Behaviour of Bashmead | A rival in love
|
| Joe the Dip | Bill the Conqueror | A crook, in league with Horace
|
| Joe the Lawyer | The Level Business Head | A dishonest bookmaker
|
| John | Bill the Conqueror | Gardener at Holly House, Wimbledon
|
| Johnny | A Prefect's Uncle | The Horton stationmaster's son
|
| Johnson, Mr | One Touch of Nature | A baseball fan
|
| Jones | The Pothunters | Boy at St. Austin's College (Ward's)
|
| Jones, Dudley | Dudley Jones, Bore Hunter | A bore-hunter
|
| Jones, Miss | A Prefect's Uncle | Matron of Leicester's House at Beckford College
|
| Jones, R. | Something Fresh | Scotland Yard are interested in him
|
| Jopp, Agnes Parsons | The Heel of Achilles | Ex-wife of Vincent Jopp
|
| Jopp, Jane Jukes | The Heel of Achilles | Ex-wife of Vincent Jopp
|
| Jopp, Luella Mainprice | The Heel of Achilles | Ex-wife of Vincent Jopp
|
| Jopp, Vincent | The Heel of Achilles | A financier
|
| Judd, Wally | Leave it to Algy | Cartoonist, draws 'Dauntless Desmond'
|
| Judson, Mr | Something Fresh | Valet to Freddie Threepwood
|
| Judson, Walter | Joy Bells for Walter | A golfer
|
| Jug | Misunderstood: A Story of the Stone Age | Ug's friend
|
| Jukes, Arthur | The Long Hole | A golfer
|
| Jukes, Cyril | Feet of Clay | A golfer
|
| Jukes, Rosie | The Inimitable Jeeves | Contestant in the Girls' Egg and Spoon Race, Twing
|
| Jules | The Adventures of Sally | Night clerk and lift attendant, Hotel Normandie, Roville
|
| June, April | Laughing Gas | A Hollywood actress, not a nice person
|
| Jupp, 'Porky' | | Wrestler, 'heavy' and friend of Jas. Waterbury
|
