NGC 6337, the Ghostly Cheerio or Cheerio Nebula, is a toroidal planetary nebula in the constellation Scorpius. It appears as a ring-shaped (annular) transparent nebula resembling a piece of the breakfast cereal Cheerios, hence the name. Filament and knots, and a faint shell surround the ring. Its magnitude is 11.90; its position in Scorpius is right ascension 17<sup>h</sup> 22<sup>m</sup>15.67<sup>s</sup>, declination -38ð 29' 01.73". The Ghostly Cheerio has a redshift value of -0.000236.
There is convincing evidence that a binary nucleus exists at the center of the nebula, with masses of 0.6 and 0.3 MâÂÂ, and a separation of ⤠1.26 RâÂÂ, indicating a probable common envelope phase. The Ghostly Cheerio's projected radial expansion is slow, averaging .
NGC 6337 is contained within, but is not a part of, the larger nebula Sh 2-5.