IC 4665 (Collinder 349 / Melotte 179) is an open cluster in the constellation Ophiuchus. It was discovered by Philippe Loys de Chéseaux in 1745. The cluster began to develop less than 40 million years ago, and lies about 1,400 light years away from Earth. It is easily visible in the smallest of telescopes and also with binoculars. From a sufficiently dark place it is also visible to the naked eye. It is one of the brightest clusters not to be cataloged by Charles Messier or William Herschel, probably because it is so loose and coarse.

IC 4665
Cluster IC 4665 with star Beta Ophiuchi below
Observation data (J2000 epoch)
Right ascension	17h 46m 18s[1]
Declination	+05° 43′ 00″[1]
Distance	1.4 kly (352 pc)
Apparent magnitude (V)	4.2[1]
Apparent dimensions (V)	45′x45′
Physical characteristics
Other designations	Cr 349, Mel 179 [1]
Associations
Constellation	Ophiuchus
See also: Open cluster, List of open clusters