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In chemistry and zoology, a trivial name (also a common name or vernacular name) is a non-systematic name. That is, the name is not recognised according to the rules of any formal (e.g. IUPAC) system of nomenclature. Many trivial names continue to be used because their sanctioned equivalents are considered too cumbersome for everyday use. For example, "tartaric acid", a compound found in wine, has a systematic name of 2,3-dihydroxybutanedioic acid. Similarly, the fish known as the tiger muskellunge is formally known as Esox masquinongy x Esox lucius.

Trivial names often have their roots in the common language; in chemistry they may come from historic usages in, for example, alchemy. Many of the names pre-date the institution of formal naming conventions. Frequently, trivial names derive from some notable property of the thing being named.

Trivial names, generally, are not useful in describing the essential properties of the thing being named such as the molecular structure of a chemical compound or the phylogenetic relationships of organisms. In some cases, trivial names can be ambiguous or will carry different meanings in different industries or in different geographic regions. On the other hand, systematic names can be so convoluted and difficult to parse that the trivial name is preferred. For example, the most important structural feature of Diazonamide is that it's a nonribosomal peptide, which is denoted by the suffix "amide".

• tert-Amyl alcohol — 2-Methylbutan-2-ol
• Carbolic acid — Phenol
• Chloroform — Trichloromethane
• Chloroprene — 2-Chloro-1,3-butadiene
• Freon — Dichlorodifluoromethane
• Isopropyl alcohol — Propan-2-ol
• Pinacolone — 3,3-Dimethylbutan-2-one
• Caffeine — 1,3,7-trimethyl-1H-purine-2,6(3H,7H)-dione
• Cholesterol — 10,13-dimethyl-17-(6-methylheptan-2-yl)-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol

• Salt -- sodium chloride
• Potash — potassium carbonate
• Caustic potash or Lye — potassium hydroxide
• Soda ash — sodium carbonate
• Caustic soda or Lye — sodium hydroxide
• Lime or unslaked lime or quicklime — calcium oxide
• Slaked lime or caustic lime — calcium hydroxide
• Muriatic acid — hydrochloric acid
• Baking soda or bicarbonate of soda — sodium bicarbonate
• Epsom salt — hydrated magnesium sulfate
• Oil of Vitriol — sulfuric acid
• Water — hydrogen oxide

• Mountain lion or Cougar or Catamount - Puma concolor
• Rainbow trout or Steelhead - Oncorhynchus mykiss
• Elk or Wapiti - Cervus canadensis
• Brook trout or Speckled trout - Salvelinus fontinalis

• Common name
• List of chemical compounds with unusual names