TCJ may refer to:

• Eiken (studio)
• The Comics Journal
• TCJ subsection at Cell junction
• Tube CAD Journal (Online Publication)
• Tree Climbing Japan (Outdoor activity)

• Tolypocladium ophioglossoides
• Tolyposporium ehrenbergi
• Tol Zari
• Tol Zari, Fars
• Tol Zireh
• Tolésén
• Tolčane
• Tolışi
• Tolışi language
• T.O.M.
• TOM1 (gene)
• TOM1L1 (gene)
• TOM1L2 (gene)
• Tom-2 Tomsk
• Toma bar Yacoub
• Tom Abel (disambiguation)
• Tom Abell
• Tom Abinanti
• Tom Abrams
• TOMA (Caldas da Rainha)
• Tomaccio
• Tomacina Culmer
• Toma Ciorba
• Toma Ciorbă
• Tom Adams (Barbadian politician)