Largest telescopes by diameter

As of 2026-07-08, OVRO 40 meter Telescope tops the list with 40 m.

1. #1 OVRO 40 meter Telescope — 40 m

   radio telescope in California

   source Wikidata
2. #2 2.6m telescope ZTSh — 2.64 m

   telescope in Crimea

   source Wikidata
3. #3 Horacio Ghielmetti Telescope — 2.15 m

   telescope

   source Wikidata
4. #4 Т-170М Telescope — 1.70 m source Wikidata
5. #5 Telescopio Carlos Sánchez — 1.52 m source Wikidata
6. #6 Xinglong 1-m Telescope — 1.00 m source Wikidata
7. #7 Yunnan 1m Telescope — 1.00 m source Wikidata
8. #8 Xinglong 85-cm Telescope — 0.85 m source Wikidata
9. #9 Southern Photometric Local Universe Survey Telescope — 0.80 m

   Telescope

   source Wikidata
10. #10 Infra Red Imaging Survey Telescope (IRIS) — 0.80 m

    telescope

    source Wikidata