Chlamydia can refer to:

• Chlamydia (bacterium), bacteria that cause infections.
• Chlamydia infection.
• Bacteria that belong to the class or phylum Chlamydiae or to the family Chlamydiaceae.
• The bacterial genus Chlamydia.
• The bacterial genus Chlamydophila.
• Chlamydia trachomatis, bacteria that cause human sexually transmitted disease and eye infections.
• Chlamydia muridarum, bacteria that cause disease in mice and hamsters (the Muridae).
• Chlamydia suis, bacteria that infect pigs (Sus suis).
• Chlamydophila pneumoniae, also known as Chlamydia pneumoniae, an airborne chlamydial species responsible for human respiratory infection and numerous animal infections.
• Chlamydophila pecorum, a chlamydial species that is common in livestock.
• Chlamydophila psittaci, a highly virulent chlamydial species prevalent in birds.
• Chlamydophila abortus, a chlamydial species that causes abortion in mammals.
• Chlamydophila felis, a chlamydial species found in cats.
• Chlamydophila caviae, a chlamydial species found in Guinea pigs.

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