Sher 25 is a blue supergiant star in the constellation Carina. It is a spectral type B1Iab star with an apparent magnitude of 12.2. The star lies close to the H II region NGC 3603 of the Milky Way, but is a foreground star. Its initial main sequence mass is calculated at 60 times the mass of the Sun, but a star of this type will have already lost a substantial fraction of that mass. It is unclear whether Sher 25 has been through a red supergiant phase or has just evolved from the main sequence, so the current mass is very uncertain.