NGC 3943 (also MCG 4-28-84 and PGC 37237) is a magnitude +13.4 face-on spiral galaxy located 300 million light-years away in the constellation Leo.
The galaxy was discovered by German-Danish astronomer Heinrich Louis d'Arrest using a 27.94 cm (11 inch) f/17.5 refractor at the Copenhagen Observatory on the 27th April 1865.
Right Ascension 11h 52m 56.6s, Declination +20° 28' 45"
