NGC 3947 is a barred spiral galaxy in the constellation of Leo.

Its velocity with respect to the cosmic microwave background is 6528 ± 23 km/s, which corresponds to a Hubble distance of 314.0 ± 22.0 Mly (96.28 ± 6.75 Mpc).

[1] In addition, three non redshift measurements give a distance of 284.67 ± 12.90 Mly (87.28 ± 3.956 Mpc).

[2] It was discovered by German-British astronomer William Herschel on 26 April 1785.

[3] Four supernovae have been observed in NGC 3947: NGC 3947 is part of the 16 member NGC 3842 group, named after the brightest galaxy in the group.