SSJ may refer to the following:
- The IATA airport code for Sandnessjøen Airport, Stokka in Sandnessjøen, Nordland, Norway
- Siervas de San Jose, a religious congregation of the Roman Catholic Church
- Sukhoi Superjet 100, a fly-by-wire regional jet
- Super Saiyan from Dragon Ball Z
- Skåne - Smålands Järnväg
- Stranka srpskog jedinstva (SSJ), a political party that existed in Serbia from 1993 until 2007.
- Sisters of Saint Joseph, a Catholic religious order