A wireless, also referred to as a radio, is an audio sound broadcasting service and a form of long-distance communication and entertainment in the wizarding world. Exactly how it works is unknown, although it is certain that it is not Muggle technology, but a magical imitation.
In 1998, Harry Potter, Ronald Weasley, and Hermione Granger would try to use the wireless to find out what was happening in the wizarding world through the renegade programme Potterwatch, which required the listener to tap their wand on the wireless and say a password; this normally would have something to do with the Order of the Phoenix, eg. "Albus" was one of the passwords.
Wizarding use of wireless airwaves has occasionally resulted in Muggles picking up programs, such as advice on how to prune on a Venomous Tentacula. This has been cited by those in favour of Wizarding use of television in the form of a television corporation, but the British Ministry of Magic feels that British radio listeners are "more tolerant, gullible, or less convinced of their own good sense, than Muggle TV viewers". The details are described in The Philosophy of the Mundane: Why the Muggles Prefer Not to Know.
- Harry Potter and the Chamber of Secrets
- Harry Potter and the Prisoner of Azkaban (Mentioned only)
- Harry Potter and the Goblet of Fire (Mentioned only)
- Harry Potter and the Order of the Phoenix (film)
- Harry Potter and the Half-Blood Prince
- Harry Potter and the Deathly Hallows
- Harry Potter and the Deathly Hallows: Part 1
- Harry Potter and the Deathly Hallows: Part 1 (video game)
- Harry Potter and the Deathly Hallows: Part 2 
- LEGO Harry Potter: Years 1-4 (Plays only Harry Potter Themes)
- LEGO Harry Potter: Years 5-7 (Plays only Harry Potter Themes)
- Pottermore (Mentioned only)