- killer of three; known for surgically removing the eyes of victims
- aka ''The Angel of Death''; nurse who killed 25 patients
- aka ''The Alligator Man'', killed at least 20 women in the early 20th century in Texas
Along with Bonnie parker, Ivan Barrow, Raymond Hamilton, Wiliam Daniel Jones
- one of the ''Lonely Hearts Killers'', along with Raymond Fernandez, killed at least three women and one child in the 1940s but suspected in up to 20 murders
- aka ''Son of Sam'' and ''The .44 Caliber Killer''; convicted of six murders
- a family who killed guests of their inn in Labette County, Kansas, in 1872 — Seem to never have been convicted and, hence, not eligible for a list of "convicted killers" by country.
- convicted of killing six men in 1988 in Kansas City, Missouri, undoubtedly killed others, sexually tortured and dismembered his victims
- Californian who with his cousin Angelo Buono were the Hillside Stranglers; killer of 13 women and suggested as possibly involved in three other killings
- aka ''The Freeway Killer''; with several accomplices, claimed the lives of 20 boys in California
, Frederick James Treesh
- Convicted of two murders in Colorado, but says he has killed 48, some of which have been corroborated.
- aka ''The Shoe-Fetish Slayer'', killed at least five women
- aka ''The Campus Killer'', ''Lady Killer'' and ''Chi Omega Killer''; law student who raped and murdered more than 30 women in several states
- Californian who with his cousin Kenneth Bianchi were the Hillside Stranglers; killer of 11 women
Cody Vernon Crawford, Oren Thacker
Michael Clark, Garland Jackson, Edward Moran Jr., Darrell Patry, Donald Taylor, Reuben Taylor, Robert Wilson
, Leigh Ann Zaepfel
Susan Carson
- murdered at least four women
Martin Rutrell, L.L. Thompson
- aka the ''Vampire of Sacramento'' murdered six people in the '70s
tried to stop aids
Henry McKenny
- aka ''The Candy Man''; committed the Houston Mass Murders with Elmer Wayne Henley and David Brooks — Killed by accomplice before conviction
- Killed 25 people in the space of just six weeks
Everett Appelgate
- nurse in New Jersey and Pennsylvania who killed as many as 40 patients through lethal injection
- Milwaukee cannibal who kept heads, skulls and body parts in his apartment; convicted of 15 murders, but believed responsible for at least two others
- aka ''The Boston Strangler''; convicted of strangling 13 women
Michelle “Mickie” Michaud
- child molester and killer of three young boys in Vancouver, Washington; hanged on January 5, 1993
- aka ''The Giggling Granny''; serial poisoner who killed 11 people: four husbands, two children, her two sisters, her mother, a grandson and a nephew.
convicted of murdering three children after having confessed to the murders of six in Los Angeles County between 1953 and 1969. He claimed at one point to have killed as many as 18.
Walter Wesley Ellebracht Jr., Robert Carlton Caldwell
Robert Handy
Alicia Woodward
- committed 52 killings & claimed a total of 100 before his hanging in 1865
- one of the ''Lonely Hearts Killers'', along with his common-law wife Martha Jule Beck; convicted of killing three people but suspected of up to 20 murders.
- aka ''The Cannibal'', ''The Moon Maniac'' and ''The Werewolf of Wisteria''; sadist and pedophile who cannibalized several children; convicted of one murder, confessed to two others and suspected in two other killings.
David Allen Kring
- aka ''Wayward Wayne''; confessed to murdering four women, believed to have killed others
- Serial killer from Poughkeepsie, NY who targeted prostitutes. After strangling the women, he would store them in various crawl spaces in and around his home.
- racist serial killer who targeted interracial couples and attempted to assassinate Larry Flynt and Vernon Jordan; convicted of eleven murders and has confessed to nine others
- aka the ''Killer Clown''; killer of at least 33 men and boys who kept bodies buried under his Chicago home
- Georgia murderer convicted of the murders of seven elderly women
- aka the ''Meanest Man in America''; Gaskins, executed on September 6, 1991; convicted of nine murders but confessed to over 200
- two known victims, one suspected victim, four missing persons; elements of Gein's life and crimes have inspired, at least in part ''Psycho'', ''The Silence of the Lambs'' and ''The Texas Chain Saw Massacre''.
- Georgia poisoner who killed her three sons, a grandson, and her husband
- ''Angel of Death'' serial killer, convicted of killing four by injection of epinephrine while working as a nurse
- Californian rapist and killer of three women; lured women to pose for "bondage photographs" and would rape and murder them.
Tracy Lynn Holland, Jon Christopher Mead
Fred Waterfield
- convicted of two rape-murders in Michigan, suspected of more.
- along with Cathy Wood, part of the Michigan duo who murdered five elderly nursing home residents in their care and claimed to have killed another
Gary Gene Tison
- murder-for-profit killer who murdered her suitors and her own children in Indiana. Never convicted of anything although was said to have killed 42.
John Kogut, John Restivo
- Alaskan baker who killed prostitutes at his cabin; convicted of four murders but admitted to 11 others.
-claimed to have committed 44 killings-possibly few as 11.
Gary Starr Adams
- aka ''Angel of Death''; hospital orderly, confessed to more than 80 "mercy killings" with 37 confirmed killings
- kept female sex slaves in his basement and killed two of them By the article's own admission
- active 1890-1894 during Chicago's 1893 World's Columbian Exposition; convicted of only one murder but definitively tied to at least 8 more and confessed to a total of 27 {various estimates go from 50 to 200}
Mona Lisa Watson
- murdered her five children
Eileen Huber, John Irvin Lewis, Robin Machuca
Christopher Giboney, Arthur Hulse, Herman Taylor
Roderick Johnson, Aubrey Jones, Michael and Terrell Whaley
- killed at least four women in Utah
O'Delle Jackson, Pearl Jackson, John Reed, Fred Glover
- aka the ''Brooklyn Strangler''; a homeless crack addict who killed at least five prostitutes
David Johnston, Norman Johnston, Ancell Eugene Hamm
- Texas pediatric nurse who poisoned infants in her care Convicted of only one murder but suspected of 10 or more others.
Jason Wayne Rose
Theodore Simmons
Jamie McMahan
- necrophiliac convicted of 21 murders in California and admitted to 7 other murders
Demarcus Smith, Matthews Heather, Laura Taylor
Myron Lance
- started killing when he was 15 years old in Santa Cruz, CA; convicted of six murders and implicated in four others
- grifter and murder-for-profit killer who, along with her son Kenneth Kimes, is believed to have killed upwards of four people
Susan Lynch
Lawrence Lingle Brittain, Ruth Renee Williams
Harry Lanham
- raped and murdered 18 people
- convicted of the murders of 16 young men and boys but strongly suspected of 51 others in California
- killed children in New Jersey in the 1920's
ex-marine and survivalist who died before trial but who is strongly suspected of having killed at least 11 people and perhaps as many as 25; collected and murdered female sex slaves with accomplice Charles Ng
Jeremiah Martel Rodgers
- aka the ''Baton Rouge Serial Killer''; convicted of two murders but linked by DNA evidence to five others
Steven Legrand
- aka the ''Brownout Strangler''; convicted of three murders while on duty with the US military in Australia
- convicted of 11 murders and confessed to about 3000 others, although most of his confessions are considered outlandish; a task force set up to investigate his claims suggested that the true number of his murders may be as high as 213
Fritz Klenner
John Williams
Cynthia Lynn Coffman
Carolyn A. King
- Alabama poisoner who murdered six family members, suspected of poisoninng at least nine; executed in 1957
Carolyn Elizabeth McCrary, Danny Sherman McCrary, Ginger McCrary, Carl Robert Taylor
William Jackson, Thomas Aikens
- aka ''The Truck Stop Killer''.