- Dec 10 Eugene O'Keefe, Canadian businessman and brewer (O'Keefe Brewery Company of Toronto Limited), born in Bandon, County Cork (d. 1913)
- Dec 16 John A C Oudemans, Dutch geographer/astronomer
- Dec 23 Wilhelm Freiherr von Tegetthoff, Austrian admiral (Helgoland/Lissa)
- Dec 28 Robert Latimer McCook, volunteers Brigadier General (Union), (d. 1862)