This list of 488 serial killers has been grouped by the killers birth month. A serial killers birth month is based in correspondence with the current month of the year at the time of the serial killer's birthday.
Birth Month: A month is a unit of time, used with calendars, which is approximately as long as a natural period related to the motion of the Moon. The serial killers birthday falls in one of the following months: January, November, December, September, July, August, April, February, March, October, June, and May. For statistical information view Serial Killers By Birth Month.
Confirmed Victims: the number of victims killed in association with a killers serial spree. Some serial killers may have other possible victims that were either unproven or the killers motives and/or methods were unrelated to the spree the killer is being documented as.