|Book debut||Arthur's TV Trouble|
|Cartoon debut||"So Long, Spanky"|
|Voiced by||Mark Camacho (s1),|
Rob Wreford (s6)
Mr. Sipple is the Read family's former next-door neighbor.
In "D.W. Rides Again," when D.W. makes a face on her bike, Mr. Sipple comes running up to her in his underwear and gives her a cabbage. He explains that, where he comes from, making a funny face on a bicycle means "Bring me a cabbage, fast!" Mr. Sipple then realizes that he left the tub running and leaves.
In "So Long, Spanky" when D.W. tries to stop Toady from running away, Toady runs into Mr. Sipple's backyard where he is mowing the lawn. D.W. tells him to stop the machine, to which he stops the lawnmower and Toady is saved!
He makes a cameo in "Arthur's Family Vacation" as the man in the JAWS-style movie.
In "Arthur and Los Vecinos," Mr. Sipple moves away, but gives Arthur and D.W. a plastic singing fish named Thelma as a farewell gift. This episode reveals that Mr. Sipple has a liking for fish and the ocean, as he wears a sailor hat, and has ocean-related hobbies, such as barbecuing fish late at night and singing Jack Was Every Inch a Sailor loudly in the shower. It is unknown where Mr. Sipple moved to and what his status is now.
- 113a. "So Long, Spanky"
- 115a. "Arthur's Family Vacation" (cameo appearance)
- 119a. "D.W. Rides Again"
- 605b. "Arthur and Los Vecinos"
- Arthur's TV Trouble (1995)
- His first name could possibly be Susy, as the name 'Susy Sipple' is on the sign-up sheet in "You Are Arthur". Or that could be a relative of him.