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)