An interferometer is a device for extracting information from the superposition of multiple waves.

Field and linear interferometers

• Air-wedge shearing interferometer
• Astronomical interferometer / Michelson stellar interferometer
• Classical interference microscopy
• Bath interferometer (common path)
• Cyclic interferometer
• Diffraction-grating interferometer (white light)
• Double-slit interferometer
• Dual-polarization interferometry
• Fabry–Pérot interferometer
• Fizeau interferometer
• Fourier-transform interferometer
• Fresnel interferometer (e.g. Fresnel biprism, Fresnel mirror or Lloyd's mirror)
• Fringes of Equal Chromatic Order interferometer (FECO)
• Gabor hologram
• Gires–Tournois etalon
• Heterodyne interferometer (see heterodyne)
• Holographic interferometer
• Jamin interferometer
• Laser Doppler vibrometer
• Linnik interferometer (microscopy)
• LUPI variant of Michelson
• Lummer–Gehrcke interferometer
• Mach–Zehnder interferometer
• Martin–Puplett interferometer
• Michelson interferometer
• Mirau interferometer (also known as a Mirau objective) (microscopy)
• Moiré interferometer (see moiré pattern)
• Multi-beam interferometer (microscopy)
• Near-field interferometer
• Newton interferometer (see Newton's rings)
• Nomarski interferometer
• Nonlinear Michelson interferometer / Step-phase Michelson interferometer
• N-slit interferometer
• Phase-shifting interferometer
• Planar lightwave circuit interferometer (PLC)
• Photon Doppler velocimeter interferometer (PDV)
• Polarization interferometer (see also Babinet–Soleil compensator)
• Point diffraction interferometer
• Rayleigh interferometer
• Sagnac interferometer
• Schlieren interferometer (phase-shifting)
• Shearing interferometer (lateral and radial)
• Twyman–Green interferometer
• Talbot–Lau interferometer
• Watson interferometer (microscopy)
• White-light interferometer (see also Optical coherence tomography, White light interferometry, and Coherence Scanning Interferometry)
• White-light scatterplate interferometer (white-light) (microscopy)
• Young's double-slit interferometer
• Zernike phase-contrast microscopy
• ZWF interferometer (microscopy)(see https://doi.org/10.1117/1.OE.55.7.074110)

Intensity and nonlinear interferometers

• intensity interferometer
• intensity optical correlator
• frequency-resolved optical gating (FROG)
• Spectral phase interferometry for direct electric-field reconstruction (SPIDER)

Quantum optics interferometers

• Hong–Ou–Mandel interferometer (HOM) (see Hong–Ou–Mandel effect)
• Franson interferometer
• Hanbury–Brown Twiss interferometer
• Polariton interferometer

Interferometers outside optics

• Acoustic interferometer
• Atom interferometer
• Neutron interferometer
• Ramsey interferometer
• Mini grail interferometer
• Aharonov–Bohm effect
• Interferometric synthetic-aperture radar (a radar-based 3-d surface mapping)
• Superconducting quantum interference devices (SQUIDs)
• White–Juday warp-field interferometer