he SOS Brigade (Spreading Excitement all Over the World with Haruhi Suzumiya Brigade) (Japanese: 世界を大いに盛り上げるための涼宮ハルヒの団, Sekai o Ōini Moriageru Tame no Suzumiya Haruhi no Dan) or simply, SOS 団 or SOS Dan, is a club created by the main character Haruhi Suzumiya at North High in May of year 0.

The club occupies the room used by the Literature Club, but replaced its sign with the SOS Brigade sign.

The club is not an official school club; it has a constitution and the five members required to form an official club, but is not sponsored by a teacher. The club acts out of the Literature Club headquarters. The Student Council refuses to recognize them, eventually sparking an antagonistic relationship with the Student Council President.