Taenia (Latin for "flat band") can refer to:
- Taenia (architecture) of Doric columns
In medicine and anatomy
- Taenia coli of the large intestine
- Taenia thalami of the mammal brain
- Taenia of fourth ventricle of the mammal brain
In zoological nomenclature
- Taenia (genus), a tapeworm genus established by Linnaeus in 1758
- Taenia, a Trichuridae roundworm genus invalidly established by Pallas in 1766; see Sclerotrichum
- Taenia, a scarab beetle genus invalidly established by Stebnicka in 2003; now Tanyana
- Taenia, a bandfish genus invalidly established by Ræse in 1793; now Cepola
- Taenia, a spelling error for the fungus moth genus Tinea