Brnik may refer to:

• Brnik, Poland, a village in Poland
• {{ill|Brnik, Republic of Macedonia|mk|Брник}}, a village in Republic of Macedonia

or:

• Zgornji Brnik, a village in Slovenia
• Spodnji Brnik, a village in Slovenia

or:

• Ljubljana Airport, a airport in Slovenia

• Trihelium-3
• Trihelium-4
• TriHIBit
• Triholder Marshall
• Trihydrate
• Trihydrogenbenzoquinonetetracarboxylate
• Trihydrogenethylenetetracarboxylate
• Trihydrogenfurantetracarboxylate
• Trihydroxidooxidophosphorus
• Trihydroxybenzoquinone
• Trihydroxyestrin
• Trihydroxymethane
• Trihypostatic God
• TRII
• Triin
• Triin Narva
• Tri-Institutional CBM Program
• Tri-iodobenzyl
• Triisopropylsilane
• Tri It
• Trijama
• Trijaya FM Network
• Trijntje Oosterhuis discography
• Trikala Aries BC
• Trikala BC Aries