The largest reflectors

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Diameter of primary mirror (meters)	Name and date of first light	Location	Altitude
39	Extremely Large Telescope (ELT) (2025)	Cerro Armazones, Chile	3046 m
30	Thirty Meter Telescope (1998)	Mauna Kea, Hawaii, USA	4050 m
25.5	Giant Magellan Telescope (2022)	Las Campanas, Chile	2516 m
11	South African Large Tel. (SALT) (2011)	Karoo, South Africa	1798 m
10.4	Gran Telescopio Canaries (2009)	Roque de los muchachos, Canarian Islands, Spain	2396 m
10.0	Keck1 (1993) Keck2 (1996)	Mauna Kea, Hawaii	4150 m
8.4	Large Sinoptic Survey Tel. (LSST) (2020)	Cerro Pachon, Chile	2715 m
8.4	Large Binocular Telescope (LBI) (2002)	Steward Observatory, Mount Graham, Az, USA	3221 m
8.3	Subaru (1999)	Mauna Kea, Hawaii	4100 m
8.2	Antu (1998)	VLT Cerro Paranal, Chile	2635 m
	Kueyen (1999)
	Melipal (2000)
	Yepun (2001)
8.1	Gemini North (1999)	Mauna Kea, Hawaii	4100 m
8.1	Gemini South (2001)	Cerro Pachon, Chile	2737 m
6.5	Monolithic Mirror Tel. (1998)	Mt. Hopkins, Arizona, USA	2616 m
6.5	Magellan (1999)	Las Campanas Obs. La Serena, Chile	2282 m
6.0	Bolshoi Teleskop Azimutalnyi (1976)	Zelentchuk, Caucasus, Russia	2070m
5.0	Hale (1948)	Palomar Mountain, California, USA	1900 m
4.2	William Herschel (1987)	Observatorio del Roque de los Muchachos La Palma, Canarian Islands, Spain	2400 m
4.0	Victor Blanco (1974)	Cerro Tololo, Chile	2200 m
3.9	Anglo-Australian (1971)	Siding Spring Obs. Coonabarabran, NSW, Australia	1145 m
3.8	Mayall (1973)	Kitt Peak, Arizona, USA	2100 m
3.8	UKIRT, infrarouge (1985)	Mauna Kea, Hawaii	4200 m
3.7	AEOS, military, tracking satellites	Maui, Hawaii	3058 m
3.6	"3m60" (1977)	European Southern Observatory (ESO) Cerro La Silla, Chile	2400 m
	Canada-France-Hawaii (1979)	Mauna Kea, Hawaii, USA	4200 m
	Telescopio Nazionale Galileo (1997)	La Palma, Canarian Islands, Spain	2370 m
3.5	MPI-CAHA (1984)	Calar Alto, Spain	2200 m
	New Technology NTT (1989)	European Southern Obs. Cerro La Silla, Chile	2400 m
	ARC (1994)	Apache Point, New Mexico, USA	2788 m
	WIYN (1994)	Kitt Peak, Arizona, USA	2100 m
	Starfire, US Air Force (1994)	Kirtland AFB, New Mexico, USA	1900 m
3.0	Shane (1959)	Lick Observatory Mount Hamilton, California, USA	1300 m
	NASA IRTF	Mauna Kea, Hawaii	4160 m
	NODO, liquid mirror, observation of orbital debris	New Mexico, USA	2758 m
2.7	Harlan Smith (1969)	Mt. Locke, Texas, USA	2100 m
2.6	BAO	Byurakan Astrophysical Observatory Byurakan, Armenia	1405 m
2.6	Shajn (1961)	Crimean Astrophysical Observatory Crimea	600 m
2.5	Hooker (1917)	Mt. Wilson, California, USA	1700 m
	Isaac Newton (1984)	Observatorio del Roque de los Muchachos La Palma, Canarian Islands, Spain	2382 m
	Nordic Optical (1988)		2382 m
	du Pont	Las Campanas Observatory La Serena, Chile	2282 m
	Sloan Digital Sky Survey	Apache Point, New Mexico, USA	2788 m
2.45	CHARA (2000)	Mt. Wilson, California, USA	1700 m
2.4	Hiltner	Kitt Peak, Arizona, USA	2100 m
2.4	Hubble Space Telescope (1990)	HST in orbit, remote from Baltimore, USA	600 000 m
2.3	WIRO, infrarouge	Jelm Mtn., Wyoming, USA	2900 m
	ANU	Siding Spring Obs. Coonabarabran, NSW, Australia	1165 m
	Bok (1969)	Steward Obs Kitt Peak, Arizona, USA	2100 m
	Vainu Bappu (1986)	Indian Institute of Astrophysics Kavalur, India	700 m
2.2	ESO-MPI (1984)	Cerro La Silla, Chile	2335 m
	MPI-CAHA (1979)	Calar Alto, Spain	2200 m
	UH	Mauna Kea, Hawaii	4200 m
2.0	Bernard Lyot (1980)	Pic du Midi, France	2850 m
2.0	2m optical infrared telescope (2000)	Hanle, Himalaya, India	4500 m
1.93	CNRS (1958)	Saint Michel de Haute Provence, France	650 m
1.8	Pan-STARRS1 (2010)	Pan-STARRS Haleakala, Maui, Hawaii, USA	4100 m
	Pan-STARRS2 (2020)

Comparison of size of the largest telescopes (c) ESO