RJ

RJ or Rj may stand for:

• Radio jockey, a person who hosts a radio talk show
• Registered jack (RJ11, RJ14, RJ45, etc.)
• Regional jet, a 35- to 100-passenger short-haul airliner
• Reproductive Justice
• Reverse jinx, a prediction about sport which is opposite from the desired outcome
• Righteous Jams, a straightedge hardcore band from Boston
• Rim job, a sexual act
• Rio de Janeiro, a Brazilian state and city
• Boeing RC-135 Rivet Joint, an American intelligence-gathering aircraft
• Romeo and Juliet, one of Shakespeare's plays
• Rubber johnny, a nickname for a condom
• In Star Trek, Rj is the chemical symbol for element-123, jamesium, named after Richard D. James