Diaphragm may refer to:

Anatomy

• Diaphragm (anatomy), a shelf of muscle extending across the bottom of the ribcage of mammals
• Urogenital diaphragm, a layer of the pelvis separating deep perineal sac from the upper pelvis
• Pelvic diaphragm, a pelvic muscle consisting of the Levator ani and the Coccygeus
• A number of structures that act as diaphragms, including the iris and the eardrum
• Any dividing structure; for example, in gasteromycetes and bryozoans, with a sense similar to that of septum

Optics and photography

• Diaphragm (optics), a stop in the light path of a lens, having an aperture that regulates the amount of light that passes
• Iris diaphragm, a variable optical diaphragm
• Diaphragm shutter, a type of optical shutter

Acoustics

• Diaphragm (acoustics), a thin, semi-rigid membrane that vibrates to produce or transmit sound waves

Other

• Diaphragm (contraceptive), a small rubber dome placed in the vagina to wall off the cervix, thus preventing sperm from entering
• Diaphragm (mechanics), a sheet of a semi-flexible material anchored at its periphery
• Diaphragm seal, a membrane that seals an enclosure
• Diaphragm pump, a type of pump
• Diaphragm arch, a type of arch
• Diaphragm wall, a type of wall
• Diaphragm valve, a type of valve

See also

• Lamina
• Membrane

Diaphragma | Diafragma | Diafragmo | Diaphragme | Diafragma | Диафрагма