Obj or OBJ may refer to:

Entities

• Ottawa Business Journal, a weekly business publication in Ottawa, Ontario, Canada

People

• Odell Beckham Jr. (born 1992), American football player, nicknamed OBJ
• Olusegun Obasanjo (born 1937), 5th and 12th President of Nigeria, nicknamed OBJ

Software

• OBJ (programming language), a programming language family developed in 1976, including OBJ2 and OBJ3
• U+FFFC  OBJECT REPLACEMENT CHARACTER, a replacement character used in computing

Files

With the .obj file extension:

• Object file, an organized machine code file created by a compiler
  • Relocatable Object Module Format, an Object file for Intel microprocessors
  • COFF, the object file format on 32-bit and 64-bit Windows
• Wavefront .obj file, a 3D geometry definition file format

This disambiguation page lists articles associated with the title OBJ.
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