| Star name | Star mean radius, kilometres | Star class | Notes | References |
| PSR B0943+10 | 2.6 | Pulsar | Neutron stars are stellar remnants produced by stars with around 8-9 solar masses or more explodes in a supernova at the end of its life. They are usually produced by stars with less than 20 solar masses, although a more massive star may produce a neutron star in certain cases. PSR B0943+10 is one of the least massive stars with 0.02 solar masses. | |
| PSR B1257+12 | 10 | Pulsar | Orbited by three planets. | |
| PSR B0531+21 | 10 | Pulsar | | |
| Geminga | 10 | Pulsar | | |
| Vela pulsar | 10 | Pulsar | | |
| XTE J1739-285 | 10.9 | Pulsar | | |
| PSR J0348+0432 A | 13 + 2 | | Orbited by a white dwarf star | |
| PSR J1748-2446ad | <16 | Pulsar | Fastest-spinning pulsar known. | |
| XTE J1650-500 B | 24 | black hole | This binary X-ray transient system, XTE J1650-500, component black hole, at 3.8 solar masses, is smaller than the previous recordholder GRO J1655-40 B of 6.3 MSun in the microquasar system GRO J1655-40. | |
| GRW +70 8247 | 3300 | white dwarf | Smallest white dwarf star known | |
| Sirius B | 5466 | white dwarf | Historically first detected white dwarf star | |
| LB 1497 | 5494.5 | white dwarf | | |
| 40 Eridani B | 5547.5 | white dwarf | | |
| ZZ Ceti | 5890 | white dwarf | | |
| GD 165 | 5998 | white dwarf | | |
| G 29-38 | 6000 | white dwarf | | |
| Procyon B | 6700 | white dwarf | | |
| ESO 439-26 | 8775.5 | white dwarf | Faintest known white dwarf. | |
| Van Maanen 2 | 9048 | white dwarf | | |
| PSR J0348+0432 B | 45268 | white dwarf | A white dwarf that orbits its pulsar companion | |
| WD 1145+017 | 13926.84 | white dwarf | Host star of one of the smallest exoplanets. | |
| EBLM J0555-57Ab | 59000 | red dwarf | This red dwarf is slightly larger than the planet Saturn. As of 2019, it is the second lightest hydrogen-fusing star known, marginally heavier than the 2MASS J0523-1403. Although its mass is comparable to that of TRAPPIST-1A, its radius is 1/3 smaller. | |
| SSSPM J0829-1309 | 61300 | red dwarf | | |
| 2MASS J0523-1403 | 70600 | red dwarf | As in 2019, with mass is the lowest known mass hydrogen-burning star. | |
| OGLE-TR-122B | 81100 | red dwarf | This was once the smallest known actively fusing star, when found in 2005, through 2013. It is the smallest eclipsing red dwarf, and smallest observationally measured diameter. | |
| Gliese 229 B | 83480 | brown dwarf | | |
| TRAPPIST-1 | 84180 | red dwarf | Hosts a planetary system with at least seven rocky planets. | |
| Teegarden's Star | 88354 | red dwarf | Two potentially habitable planets | |
| Luyten 726-8 | 97000 | red dwarf | | |
| Proxima Centauri | 101000 | red dwarf | This is the nearest neighbouring star to the Sun. | |
| Wolf 359 | 111400 | red dwarf | | |
| Ross 248 | 111400 | red dwarf | | |
| Barnard's Star | 136400 | red dwarf | | |
| CM Draconis B | 167000 | red dwarf | | |
| Ross 154 | 167000 | red dwarf | | |
| CM Draconis A | 176000 | red dwarf | | |
| Z Andromedae B | 184530.63 | White dwarf | Largest white dwarf | |
| Kapteyn's Star | 203000 | Red dwarf | This is the closest halo star to the Sun. | |
| Luyten's Star | 243500 | Red dwarf | | |
| Teide 1 | 270240 | Brown dwarf | | |
| Lalande 21185 | 273500 | Red dwarf | | |
| Lacaille 9352 | 320000 | Red dwarf | | |
| Type | | Radius
| Radius
| Radius
| Radius
| Date | Notes | References |
| Red dwarf | EBLM J0555-57Ab | 0.084 | 0.84 | | | 2017 | The red dwarf stars are considered the smallest stars known, and representative of the smallest star possible. | |
| Brown dwarf | Cha 110913-773444 | | | | | 2004 | Brown dwarfs are not massive enough to build up the pressure in the central regions to allow nuclear fusion of hydrogen into helium. They are best described as extremely massive gas giants that were not able to ignite into a hydrogen-fusing star. | |
| White dwarf | GRW +70 8247 | 0.0047 | 0.047 | 0.52 | | 1934 | White dwarfs are stellar remnants produced when a star with around 8 solar masses or less sheds its outer layers into a planetary nebula. The leftover core becomes the white dwarf. It is thought that white dwarfs cool down over quadrillions of years to produce a black dwarf. | |
| Neutron star | PSR B0943+10 | | | | 2.6 km
| | Neutron stars are stellar remnants produced by stars with around 9 solar masses or more explodes in a supernova at the end of its life. They are usually produced by stars with less than 20 solar masses, although a more massive star may produce a neutron star in certain cases. PSR B0943+10 is one of the least massive stars with 0.02 solar masses. | |
| Stellar-mass black hole | XTE J1650-500 B | | | | | 2008 | Black holes are stellar remnants usually produced when extremely massive stars explode in a supernova or hypernova at the end of their lives. | |
