TNZ can refer to: tinidazole, an anti-parasitic drug the thermal neutral zone, the temperature range that a warm-blooded organism can tolerate an informal abbreviation for Tanzania the Ten'edn language spoken in Thailand and Malaysia Ti–13Nb–13Zr, a metal that is an alloy of titanium, niobium, and zirconium Transit New Zealand, a former New Zealand government agency Team New Zealand, in some sports events Team New Zealand of yachting