Radio 4 may refer to:
Radio stations BBC Radio 4, a British national public service radio station BBC Radio 4 Extra, BBC Radio 4's sister station NPO Radio 4, the former name of Dutch radio station NPO Klassiek Radio 4, the former name of Malaysian English-language radio station Traxx FM Radio 4, the former name of Singaporean Tamil-language radio station Oli 968 Ràdio 4, a Spanish Catalan-language radio station Raadio 4, an Estonian Russian-language radio station
Other uses Radio 4 (band), a New York dance-punk band Radio 4, a Public Image Ltd song on Metal Box