The Bayer designations X Puppis and x Puppis are distinct and refer to three different stars in the constellation Puppis:
- X Puppis, a δ Cephei variable
 - X Puppis, (HR 2548, 38 G. Puppis) an F-type main-sequence star
 - x Puppis, (HR 2518, HD 49591, 31 G. Puppis), a B-type main-sequence star
 
See also
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