THE iDOLM@STER SideM Radio 315Pro Night!

THE iDOLM@STER: SideM Radio 315 Pro Night! (アイドルマスター SideM ラジオ 315プロNight! Aidorumasutaa Saido Emu Saikou Puro Naito) is the official radio broadcast of THE iDOLM@STER: SideM franchise. Since April 5, 2015, it had been broadcast every Friday at 9:00 PM Japan time through its own Niconico channel. Each episode is pre-recorded, except for those from May 2015 to April 2016, which had been live broadcasts.

After DRAMATIC STARS' Shuugo Nakamura, Yuuma Uchida, and Taku Yashiro hosted the first 50 episodes, each unit's voice actors took turns hosting the radio for three months each. Notable exceptions to this include when DRAMATIC STARS returned to host episodes 115 to 138, and when F-LAGS hosted episode 249 to introduce Kazuki Tsukumo's new voice actor Shunya Hiruma.

Starting July 2020, voice actors from different units will be chosen to host the radio for one month each, with the first combination being DRAMATIC STARS' Shuugo Nakamura, High×Joker's Yuusuke Shirai, and Shinsoku Ikkon's Toshinari Fukamachi.