Chlamydia may refer to:

• Chlamydia infection, a sexually transmitted infection
• Chlamydia (bacterium), a genus of pathogenic bacteria
  • Chlamydia trachomatis, causing human sexually transmitted disease and eye infections
  • Chlamydia muridarum, causing disease in mice and hamsters (the Muridae)
  • Chlamydia suis, bacteria that infect pigs (Sus suis)
• Chlamydophila, another genus of pathogenic bacteria
  • 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 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
• Chlamydiaceae, family of bacteria including Chlamydia and Chlamydophila
• Chlamydiae, class of bacteria including Chlamydiaceae

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