- Calar Alto Observatory (CAHA)
- For raw and reduced data from Calar Alto. CARMENES also has other data at the CARMENES-specific archive here.
- Canada-France-Hawaii Telescope (CFHT)
- Contains raw and reduced data from CFHT, as well as a number of other observatories, including Hubble.
- ESO Phase 3 Archive
- For reduced data from the European Southern Observatory.
- ESO Main Data Archive
- Contains a wider range of instruments, but features mainly raw, unreduced data. Data reduction tools and an FAQ page can be found here and here respectively.
- Gemini Observatory Archive
- For raw and reduced data products from the Gemini Observatory.
- Gran Telescopia Canarias Archive
- For raw and reduced data products of the GTC.
- Italian Center for Astronomical Archives
- Some data archives listed here (LBT, TNG) are run by IA2, as well as others, which are listed at the bottom of their main page.
- Infrared Science Archive (NASA/IPAC)
- Contains data from numerous telescopes, including but not limited to WISE, 2MASS, Spitzer, and the Planck Telescope.
- Keck Observatory Archive
- For raw and reduced data from the Keck Telescope. Reduced data must be explicitly requested in the interface above the file list, otherwise only the raw images will be available. A link to data reduction utilities can be found here.
- Large Binocular Telescope Archive
- Raw data from the Large Binocular Telescope. A link to data reduction utilities can be found here. There is also a separate link for LBT Interferometer data here.
- NOIRLab Astro Data Archive
- Contains data from Kitt Peak, Bok, Cerro Tololo, SOAR, and WIYN Observatories. The new NEID spectrograph at WIYN also has its own data archive here.
- Subaru Telescope Archive (SMOKA)
- Contains only raw data.
- Telescopio Nazionale Galileo Archive
- Note: Reduced products are interspersed with raw data with no explicit flag to tell the difference. For example, in GIANO-B spectra, the reduced, 1D spectrum files have names which end in "ms1d".