RSJ
RSJ may refer to:
- Religious Sister of St Joseph, post-nominal by members of the Congregation of Sisters of St Joseph of the Sacred Heart
 - Rock Street Journal, an Indian rock magazine
 - Rolled steel joist or I-beam
 - RSJ (band), a metalcore band from York, UK
 - Richard Speight Jr., an actor from Nashville, TN
 - Ricky Stenhouse Jr., American racing driver