Bessatsu Margaret (別冊マーガレット, Bessatsu Māgaretto, "Margaret additional volume"), or Betsuma (別マ) for short, is a shōjo manga magazine published monthly in Japan by Shueisha since 1964.

[3][4][5] The stories featured in it are noted to have an emphasis on character growth, focusing on themes of interpersonal relationships and settings of everyday life.

It initially began as a quarterly one-shot publication, before moving to a monthly serialization in 1965.

At the time, this initiative was considered groundbreaking, and became the basis of the submission systems used among other manga magazines to this day.

[6][7] In 1972, Bessatsu Margaret became the first monthly shōjo magazine to surpass 1 million copies in circulation.