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Diaphragm may refer to:

Anatomy

* Thoracic diaphragm, a thin sheet of muscle between the thorax and the abdomen
* Pelvic diaphragm or pelvic floor, a pelvic structure
* Urogenital diaphragm or triangular ligament, a pelvic structure

Other

* Diaphragm (optics), a stop in the light path of a lens, having an aperture that regulates the amount of light that passes
* Diaphragm (acoustics), a thin, semi-rigid membrane that vibrates to produce or transmit sound waves
* Diaphragm (birth control), a small rubber dome placed in the vagina to wall off the cervix, thus preventing sperm from entering
* Diaphragm (mechanical device), a sheet of a semi-flexible material anchored at its periphery
* Diaphragm (structural system), a structural engineering system used to resist lateral loads

See also

* Diaphragm arch
* Diaphragm pump
* Diaphragm seal, a membrane that seals an enclosure
* Diaphragm shutter, a type of leaf shutter consisting of a number of thin blades in a camera
* Diaphragm valve
* Diaphragm wall
* ''Diaphragma'', a genus of algae
* Lamina (disambiguation)
* Membrane (disambiguation)

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