List of largest star clusters

Below is a list of the largest known star clusters, ordered by diameter in light years, above the size of 50 light years in diameter. This list includes globular clusters, open clusters, super star clusters, and other types.

List

List of largest known star clusters
Cluster name	Diameter (light-years)	Type of cluster	Notes
Terzan 7	316^[1]	Globular cluster
Messier 54	306^[2]
NGC 339	238^[3]
Messier 3	226^[4]
Messier 11 (Wild Duck Cluster)	190^[5]	Open cluster
Messier 2	174.4^[6]	Globular cluster
Omega Centauri	172 ± 12^[7]		Largest globular cluster in the Milky Way.^[8]
Messier 13	168^[9]
Messier 15	166^[10]
Palomar 5	152^[11]
Messier 75	126^[12]
47 Tucanae	120^[13]
Messier 68	106^[14]
Messier 22	100 ± 10^[15]		One of the first star clusters ever discovered.^[16]
Messier 14	100^[15]
Messier 62	98^[17]
Messier 55	96^[18]
NGC 265	94^[19]	Open cluster
Messier 69	90^[20]	Globular cluster
Messier 9	90^[21]
Messier 56	84^[22]
Messier 10	83.2^[23]
NGC 3201	80^[24]
Messier 107	79^[25]
Messier 46	75.6^[26]	Open cluster
Messier 4	75^[27]	Globular cluster	Nearest globular cluster to the Earth. Also the first globular cluster known to have exoplanets (PSR B1620-26b)
Messier 12	74.4^[28]
Messier 70	68^[29]
NGC 290	66^[30]	Open cluster
Messier 28	60^[31]	Globular cluster
Messier 18	52.4^[32]	Open cluster
The following notable star clusters are listed for the purpose of comparison.
MGC1	49 (half-light), 7,800 (tidal)^[33]	Globular cluster
Mayall II	42±1 (half-light), 526±25.4 (tidal)^[34]	Globular cluster
Pleiades	40.68^[35]	Open cluster	Nearest Messier Object to Earth and the easiest to see in the night sky.
RSGC2 (Stephenson 2)	26.1^[36]
Alpha Persei cluster	22.8^[37]
Jewel Box	20^[38]
Hyades	17.6^[39]		Nearest open cluster
Beehive Cluster (Praesepe)	15^[40]
RSGC1	9.78 ± 1.96^[41]
Westerlund 1 (Ara Cluster)	6.52^[42]	Super Star Cluster/Open cluster