Diaphragm

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