Sher 25 is a blue supergiant star in the constellation Carina, located approximately 25,000 light years from the Sun in the H II region NGC 3603 of the Milky Way.

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.

[8] The name derives from the original cataloguing of stars in NGC 3603 by David Sher.

[9] The same star was numbered 13 by Melnick, Tapia, and Terlevich[3] (MTT 13) and 5 in a Hubble Space Telescope survey by Moffat, Drissen, and Shara[10] (NGC 3603 MDS 5).

It is speculated that Sher 25 is near the point of exploding as a supernova, as it has recently thrown off matter in a pattern similar to that of supernova 1987A in the Large Magellanic Cloud, with a circumstellar ring and bipolar outflow filaments.