NGC 3684 (also UGC 6453, MCG 3-29-50, IRAS 11245 + 1718, and PGC 35224) is a magnitude +11.5 spiral galaxy located 53 million light-years away in the constellation Leo. In the sky it can be found roughly 13' southwest of the galaxy NGC 3686.
The galaxy was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshire, on the 17th April 1784. The galaxy was rediscovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Windsor Road, Slough, on the 17th March 1831.
Right Ascension 11h 27m 11.1s, Declination Dec +17° 01' 51"