Septemberist

Septemberist or Septemberism may refer to:
 * Septembrism or Setembrismo, a Portuguese political movement in the 1830s
 * Dimitrovist Pioneer Organization "Septemberists", part of the Bulgarian pioneer movement
 * Septemberists, insurgents involved in the September Uprising in Bulgaria in 1923
 * "Septemberism", a 2010 song by Man Overboard from Real Talk