TNB may stand for: Trinitrobenzene, kinds of nitrated benzene-derivatives Tacoma Narrows Bridge, Washington state, US Throgs Neck Bridge, New York City, US TNB frame (Tangent-Normal-Binormal), a mathematical coordinate system Tenaga Nasional Berhad, an electricity company in Malaysia National Theatre Bucharest (Teatrul Naţional "Ion Luca Caragiale" București) The National Bank (Palestine) Transthoracic needle biopsy, a type of lung biopsy Tuas Naval Base, the second naval base of the Republic of Singapore Navy