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- Head length: the distance from the tip of the snout (or upper lip) to the most posterior point of the opercular margin
- Heterocercal fin: not symmetric (sharks)
- Homocercal fin: symmetric
- Homology: similarity of features based on common evolutionary descent
- Hyperostosis: a condition resulting in enlargement of areas of bone.
- Hyaline: translucent or transparent
- Hypural joint: the joint between the caudal fin and the last of the vertebrae
- Hypural plate: the flattened bony plate at the posterior end of the vertebral column, formed from parts of the posterior vertebrae.
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