Rivalen may refer to:

• The German language title of the 1923 film Rivals (1923 film), directed by and starring Harry Piel
• USS Rivalen (SP-63), a vessel of the US Navy in service 1917-1919

• P.J. Simon
• PJ (singer)
• P. J. Smit
• P.J.'s (nightclub)
• PJ's (nightclub)
• P J Squires
• P. J. Squires
• PJ Steenkamp
• PJS v News Group Newspapers
• PJT Partners
• PJTSAU
• PJU 5 station
• P. julianettii
• P. J. Viehoff
• PJ Vogt
• PJW
• P. J. Walker
• P. J. Washington
• P. J. Wolfson
• P.J.W. Restaurant Group
• PK-17
• PK (2014 film)
• PK3 (song)
• PK4 (song)
• PK-61