La tinta de calamar es una especie de pigmento oscuro que desprenden algunos cefalópodos, por regla general se trata de una estrategia de evasión. Todos los cefalópodos, con la excepción de los Nautilidae y la especie de los octopus que pertenecen a la suborden de los Cirrina, son capaces de emitir este pigmento, que popularmente se denomina tinta. Esta tinta se emplea en algunos países del área mediterránea en la elaboración de algunos platos.

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Cephalopod ink is a dark pigment released into water by most species of cephalopod, usually as an escape mechanism. All cephalopods, with the exception of the Nautilidae and the Cirrina (deep-sea octopuses), are able to release ink. The ink is released from the ink sacs (located between the gills) and is dispersed more widely by accompanying its release with a jet of water from the siphon. Its dark colour is caused by its main constituent, melanin. Each species of cephalopod produces slightly differently coloured inks; generally, octopuses produce black ink, squid ink is blue-black, and cuttlefish ink is a shade of brown. A number of other aquatic molluscs have similar responses to attack, including the gastropod clade known as sea hares.

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