Carl Adolph Agardh (1785 - 1859) was a Swedish botanist specializing in algae and was eventually appointed bishop of Karlstad.

Agardh was appointed professor of botany and practical economy at Lund University in 1812, was ordained a clergyman in 1816 and received two parishes as prebend. He was rector magnificus of Lund University 1819-1820 and appointed bishop of Karlstad in 1835, where he remained until his death.

He was a representative in the clerical chamber of the Swedish Parliament on several occasions from 1817, was elected a member of the Swedish Academy in 1831. His botanical speciality was algae.

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