Bessatsu Margaret (別冊マーガレット, Bessatsu Māgaretto), or Betsuma (別マ) for short, is a shōjo manga magazine published monthly in Japan by Shueisha. It is targeted at girls aged roughly 12 to 17. It is a spinoff of the magazine Margaret. The magazine is being published since 1963. The circulation in 70s and 80s was in between 1,300,000 to 1,800,000 copies, but since then it's on decline, going under 400,000 after year 2000. The circulation for 2015 was 211,250 copies.
In 2010, the magazine launched a spin-off seasonal magazine to Betsuma, called Betsuma sister.