NGC 6866 is an open cluster in the constellation Cygnus. It was discovered by Caroline Herschel on 23 July 1783.

| NGC 6866 | |
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| Observation data (J2000 epoch) | |
| Constellation | Cygnus |
| Right ascension | 20h 3.7m [1] |
| Declination | +44° 00′[1] |
| Distance | 3900 Ly (1450 pc) |
| Apparent magnitude (V) | 7.6 |
| Apparent dimensions (V) | 7' |
| Physical characteristics | |
| Other designations | Cr 412, C2002+438, OCL 183 |
| See also: Open cluster, List of open clusters | |
New General Catalogue 6500 to 6999 | |
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Constellation of Cygnus | |||||||||||
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