NGC 5605 is an intermediate spiral galaxy in the constellation of Libra. Its velocity with respect to the cosmic microwave background is 3635 ± 18 km/s, which corresponds to a Hubble distance of 174.9 ± 12.3 Mly (53.61 ± 3.76 Mpc). In addition, three non redshift measurements give a distance of 194.72 ± 0.68 Mly (59.700 ± 0.208 Mpc). The galaxy was discovered by German-British astronomer William Herschel on 11 May 1784.

The SIMBAD database lists NGC 5605 as a Seyfert II Galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.

NGC 5605 is the only galaxy known where three supernovae were visible at the same time. The first was SN 2022bn (type Ib, mag. 18.6), discovered on 5 January 2022. The second supernova, SN 2022ec (type II, mag 18.8), was reported on 7 January. The third, SN 2022pv (type II, mag 19.1), was discovered on 13 January.

• List of NGC objects (5001–6000)

• Media related to NGC 5605 at Wikimedia Commons
• NGC 5605 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images