Tunel could refer to:

1. Tünel, a sum in Mongolia
2. Tünel, a subway system in Istanbul
3. The TUNEL assay (Terminal deoxynucleotidyl transferase mediated dUTP Nick End Labeling assay), a fluorescence method for measuring cell death (cells undergoing apoptosis or necrosis).
4. Tunel (film), bosnian film from 2000

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