From BR Bullpen
December is the twelfth month of the year.
 Births on Unknown Days in December
- 1845 - Fred Waterman, infielder (d. 1899)
- 1856 - Spud Johnson, outfielder (d. ????)
- 1893 - Howard Lindimore, minor league infielder (d. 1933)
- 1918 - Ralph Nelles, minor league executive (d. 2009)
 Deaths on Unknown Days in December