NGC 18

{{Short description|Double star system in the constellation of Pegasus}}

{{Use dmy dates|date=December 2019}}

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| image = 280px

| caption =

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| constell = Pegasus{{cite web|work=Celestial Atlas|url=http://cseligman.com/text/atlas/ngc0.htm|title=NGC Objects: NGC 1 - 49|author=Seligman, Courtney|date=March 2010|access-date=27 October 2010}}

| epoch = J2000

| ra = {{RA|00|09|23}}

| dec = {{DEC|+27|43|56}}

| appmag_v = 14

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| names = Pul-3 10207/10208{{cite simbad|title=Pul-3 10207|access-date=31 January 2018}}{{cite simbad|title=Pul-3 10208|access-date=31 January 2018}}

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| Simbad = Pul+-3+10207 |sn=Pul-3 10207

| Simbad2 = Pul+-3+10208 |sn2=Pul-3 10208

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NGC 18 is a double star system located in the constellation of Pegasus. It was first recorded by Herman Schultz on 15 October 1866. It was looked for but not found by Édouard Stephan on 2 October 1882. It was independently observed by Guillaume Bigourdan in November 1886.

Both stars are {{val|2528|20}} light-years away, and based on this distance have a minimum separation of approximately 2,700 astronomical units, an unusually wide separation for a binary system.