| Aaron Alexis | 2013 | USA | 12 |
| Aaron Brian Gunches | 2002 | USA | 1 |
| Abbas al-Baqir Abbas | 2000 | Sudan | 22 |
| Abdallah Ahmed-Osman | 2020 | France | |
| Abdelaâli Hadi | 2000 - 2004 | Morocco | 9 |
| Abdufatto Tashpulatovich Zamanov | 2002 - 2004 | Russia | 14 |
| Abdullah Çatlı | 1978 - 1996 | Turkey | 3+ |
| Abdullah Shah | 1990 | Afghanistan | 20 |
| Abel Clemmons | 1805 | USA | 9 |
| Abraham Thomas | 1954 | USA | 4 |
| Abul Djabar | 1960 - 1970 | Afghanistan | 65 |
| Ada Chard Williams | 1899 | United Kingdom | 1 |
| Adam Christopher Mayes | 2012 | USA | 2 |
| Adam Leroy Lane | 2007 | USA | 2 |
| Adam Peter Lanza | 2012 | USA | 27 |
| Adelaide Blanche Bartlett | 1885 - 1886 | France | 1 (alleged) |
| Adnan Çolak | 1992 - 1995 | Turkey | 11 |
| Adolf Gustav Seefeldt | 1933 - 1935 | Germany | 12+ |
| Adolfo de Jesús Constanzo | 1986 - 1989 | Mexico | 16 |
| Adolph Louis Luetgert | 1897 | USA | 1 |
| Adolph Theodore Laudenberg | 1972 - 1975 | USA | 4+ |
| Adremy Dennis | 1994 | USA | 1 |
| Adrian Ernest Bayley | 2012 | Australia | 1 |
| Adrie Mondria | 1978 - 1997 | Netherlands | 4 |
| Agnes Magnúsdóttir | 1828 | Iceland | 2 |
| Agnus McVee | 1875 - 1885 | Canada | 8+ |
| Ahmad Ahmadi | 1920 - 1930 | Iran | 2 |
| Ahmad Isma'il 'Uthman Saleh | 1990 - 1997 | Egypt | 1+ |
| Ahmad Suradji | 1986 - 1997 | Indonesia | 42+ |
| Ahmed Ibragimov | 1999 | Russia | 34 |
| Aileen Wuornos | 1989 - 1990 | USA | 7 |
| Aimal Kansi | 1993 | USA | 2 |
| Aimé Simard | 1997 | Canada | 3 |
| Aino Nykopp-Koski | 2004 - 2009 | Finland | 5 |
| Akira Nishiguchi | 1963 | Japan | 5 |
| Akshay Thakur | 2012 | India | 1 |
| Aladena James Fratianno | 1937 - 1977 | USA | 5 |
| Alain Lamare | 1978 - 1979 | France | 1 |
| Alan Eugene Miller | 1999 | USA | 3 |
| Alan Lehman Matheney | 1989 | USA | 1 |
| Albert Edward Horsley | 1905 | Canada | 1 |
| Albert Fish | 1910 - 1932 | USA | 3+ |
| Albert Foulcher | 1993 - 2001 | | 5 |
| Albert Greenwood Brown Jr. | 1980 | USA | 1 |
| Albert Henry DeSalvo | 1962 - 1964 | USA | 1+ |
| Albert Jay Clozza | 1983 | USA | 1 |
| Albert Joseph Pierre Bruneau | 1893 | France | 1 |
| Albert Smidt | 1888 - 1890 | Germany | 2+ |
| Albert Tannenbaum | 1930 - 1940 | USA | 1+ |
| Albert William Goozee | 1956 | United Kingdom | 2 |
| Alejandro Máynez | 1980 - 1990 | Mexico | 2+ |
| Alek Minassian | 2018 | Canada | 11 |
| Aleksandr Andreevich Rubel | 1997 - 1998 | Estonia | 6+ |
| Aleksandr Ivanovich Berlizov | 1970 - 1974 | Soviet Union | 9 |
| Aleksey Vasilyevich Sukletin | 1979 - 1985 | Soviet Union | 7 |
| Alexander Alekseevich Labutkin | 1933 - 1935 | Soviet Union | 15 |
| Alexander Hernandez | 2014 | USA | 5+ |
| Alexander Nikolaevich Tchayka | 1994 | Ukraine | 4 |
| Alexander Nikolayevich Astashev | 2003 - 2005 | Russia | 17 |
| Alexander Nikolayevich Spesivtsev | 1991 - 1996 | Russia | 20+ |
| Alexander Pearce | 1822 - 1824 | Ireland | 2+ |
| Alexander Sergeevich Pustovalov | 1995 - 1999 | Russia | 22 |
| Alexander Vasilyevich Kiselev | 2003 - 2022 | Russia | 3 |
| Alexander Viktorovich Solonik | 1990 - 1997 | Russia | 5+ |
| Alexander Vladimirovich Bychkov | 2009 - 2012 | Russia | 9+ |
| Alexander Wayne Watson Jr. | 1986 - 1994 | USA | 4 |
| Alexander Yuryevich Pichushkin | 1992 - 2006 | Russia | 49+ |
| Alexandra Lefevre | 2003 | France | 5 |
| Alexandre Alves Nardoni | 2008 | Brazil | 1 |
| Alexandre Bissonnette | 2017 | Canada | 5 |
| Alexei Andreyevich Varakin | 2010 - 2023 | Uzbekistan | 4 |
| Alfonso Basterra Camporro | 2013 | Spain | 1 |
| Alfonza Smalls | 1993 | USA | 2 |
| Alfred Andrew Knapp | 1894 - 1902 | USA | 5+ |
| Alfred Bye | 1941 | Australia | 1 |
| Alfred Charles Whiteway | 1953 | USA | 2 |
| Alfred Griner Packer | 1874 | USA | 5 |
| Alfred J. Gaynor | 1995 - 1998 | USA | 9 |
| Alfred Leonard Cline | 1930 - 1945 | USA | 9 |
| Alfredo Galán Sotillo | 2003 | Spain | 6+ |
| Alfredo Rolando Prieto | 1988 - 1990 | USA | 9 |
| Ali Amrozi bin Haji Nurhasyim | 2000 - 2002 | Indonesia | 202+ |
| Ali Asghar Borujerdi | 1908 - 1934 | Iran | 33 |
| Ali Ghufron bin Haji Nurhasyim | 2000 - 2002 | Indonesian | 200+ |
| Ali Hassan Abu Kamal | 1997 | Palestine | 1 |
| Ali Mahmood Awad Irsan | 2012 | USA | 2 |
| Alice Arden | 1551 | United Kingdom | 1 |
| Alice Bradley Sheldon | 1987 | USA | 1 |
| Alice Crimmins | 1965 | USA | 2 |
| Alice Jessie Mitchell | 1892 | USA | 1 |
| Alice Lois Lindsay Wynekoop | 1933 | USA | 1 |
| Allan Baker | 1973 | Australia | 2 |
| Allan Joseph Legere | 1986 - 1989 | Canada | 5 |
| Allan Michael Grimson | 1997 - 1998 | United Kingdom | 2+ |
| Allan Patterson Newman | 1991 - 1992 | USA | 4 |
| Allen Fryer | 1973 | USA | 4 |
| Allen Lane Griffin Jr. | 1997 | USA | 3 |
| Allen Lee Davis | 1982 | USA | 4 |
| Allyson McConnell | 2010 | Australia | 2 |
| Altemio Sanchez | 1975 - 2006 | USA | 3+ |
| Alton Alexander Nolen | 2014 | USA | 1+ |
| Alton Coleman | 1984 | USA | 8 |
| Alvin Andrew Kelly | 1984 | USA | 4 |
| Alyssa Dailene Bustamante | 2009 | USA | 1 |
| Amber Michelle Hilberling | 2011 | USA | 1 |
| Amelia Elizabeth Dyer | 1869 - 1896 | United Kingdom | 6+ |
| Amelia Sach | 1900 - 1902 | United Kingdom | 12+ |
| Amerigo Dumini | 1921 - 1945 | Italy | 1 |
| Amir Qayyum | 2005 | Pakistan | 14 |
| Amy Archer-Gilligan | 1907 - 1917 | USA | 5+ |
| Amy Bishop | 2010 | USA | 3 |
| Amy S. Grossberg | 1996 | USA | 1 |
| Amy T. Hebert | 2007 | USA | 2 |
| Ana di Pištonja | 1920 - 1928 | Died of natural causes | 50+ |
| Ana Maria Cardona | 1990 | USA | 1 |
| Anastasiya Tarverdiyeva | 2007 - 2013 | Russia | 30+ |
| Anatoli Neželski | 1994 - 1996 | Estonia | 3 |
| Anatoly Huseinovich Nagiyev | 1979 - 1980 | Soviet Union | 6+ |
| Anatoly Nikolaevich Biryukov | 1977 | Soviet Union | 5 |
| Anatoly Yemelianovich Slivko | 1964 - 1985 | Soviet Union | 7+ |
| Anatoly Yuriyovych Onoprienko | 1989 - 1996 | Ukraine | 52 |
| Anders Behring Breivik | 2011 | Norwegian | 77+ |
| Anders Lindbäck | 1864 | Sweden | 7 |
| András Pándy | 1986 - 1990 | Belgium | 6 |
| Andre Crawford | 1993 - 1999 | USA | 11 |
| Andre Lee Thomas | 2004 | USA | 3 |
| Andre Vernell Jones | 1978 - 1979 | USA | 5+ |
| Andrea Matteucci | 1980 - 1995 | Italy | 4 |
| Andrea Pia Yates | 2001 | USA | 5 |
| Andreas Hall | 1847 - 1848 | USA | 3 |
| Andrei Ivanovich Barausov | 1983 - 1997 | Russia | 7 |
| Andrei Romanovich Chikatilo | 1978 - 1990 | Soviet Union | 52+ |
| Andrei Vladimirovich Sibiryakov | 1988 - 1989 | Soviet Union | 5 |
| Andrés Aldije Monmejá | 1889 - 1904 | France | 6 |
| Andrés Filomeno Mendoza Celis | 1991 - 2021 | Mexico | 19 |
| Andrés Leonardo Achipiz | 2010 - 2013 | Colombia | 12 |
| Andrés Ulises Castillo Villarreal | 2009 - 2015 | Mexico | 3+ |
| Andrew David Edwards | 1987 - 1992 | USA | 4 |
| Andrew Dawson | 1981 - 2010 | United Kingdom | 3 |
| Andrew Douglas Golden | 1998 | USA | 5 |
| Andrew Grant DeYoung | 1993 | USA | 3 |
| Andrew Hampton Mickel | 2002 | USA | 1 |
| Andrew John Engeldinger | 2012 | USA | 6 |
| Andrew Kokoraleis | 1981 - 1982 | USA | 17 |
| Andrew Lee Jones | 1984 | USA | 1 |
| Andrew Levi Hammond | 2020 - 2022 | USA | 3 |
| Andrew O. Maltais | 1979 | USA | 1 |
| Andrew Phillip Cunanan | 1997 | USA | 5 |
| Andrew Pixley | 1964 | USA | 2 |
| Andrew Reid Lackey | 2005 | USA | 1 |
| Andrew Sibusiso Zondo | 1985 | South Africa | 5 |
| Andrew Simon Aston | 2001 | United Kingdom | 2 |
| Andrew Urdiales | 1986 - 1996 | USA | 8 |
| Andrew Wamsley | 2003 | USA | 2 |
| Andrey Sergeyevich Yezhov | 2010 - 2020 | Russia | 7 |
| Andrey Shpagonov | 1992 | Russia | 9 |
| Ane Cathrine Andersdatter | 1853 - 1861 | Denmark | 3 |
| Ángel Francisco Breard | 1992 | Paraguay | 1 |
| Ángel Maturino Reséndiz | 1986 | Mexico | 15 |
| Ángel Nieves Díaz | 1978 - 1981 | Puerto Rico | 2+ |
| Angela Jane Johnson | 1933 | USA | 5 (As an accomplice) |
| Angelica Salazar Alvarez | 2006 | USA | 4 |
| Angelina Napolitano | 1911 | Canada | 1 |
| Angelina Rodriguez | 2000 | USA | 1 |
| Angelo Buono Jr. | 1977 - 1978 | USA | 10 |
| Anísio Ferreira de Sousa | 1989 - 1992 | Brazil | 3 |
| Aniza binte Essa | 2007 | Singapore | 1 |
| Anjette Lyles | 1952 - 1958 | USA | 4 |
| Ann Beddingfield | 1762 - 1763 | United Kingdom | 1 |
| Ann Bilansky | 1859 | USA | 1 |
| Anna Carolina Trotta Peixoto Jatobá | 2008 | Brazil | 1 |
| Anna Månsdotter | 1889 | | 1 |
| Anna Maria Zwanziger | 1808 - 1809 | Germany | 4 |
| Anna Marie Hahn | 1933 - 1937 | USA | 5 |
| Anne Perry | 1954 | United Kingdom | 1 |
| Anne Turner | 1613 | United Kingdom | 1 |
| Annice | 1828 | USA | 5 |
| Annie Hearn | 1926 - 1930 | United Kingdom | 2+ |
| Annie Walters | 1900 - 1902 | United Kingdom | 12+ |
| Annika Maria Östberg Deasy | 1972 - 1981 | USA | 3 |
| Ansis Alberts Kaupēns | 1920 - 1926 | Latvia | 19 |
| Anthony Allen Shore | 1986 - 1995 | USA | 4+ |
| Anthony Arkwright | 1988 | United Kingdom | 3 |
| Anthony Armstrong | 1994 | United Kingdom | 1 |
| Anthony Balaam | 1994 - 1996 | USA | 4 |
| Anthony Capo | 1989 - 1999 | USA | 2 |
| Anthony Chebatoris | 1937 | USA | 1 |
| Anthony Cook | 1973 - 1981 | USA | 9+ |
| Anthony Floyd Wainwright | 1994 | USA | 1 |
| Anthony Grandison | 1983 | USA | 2 |
| Anthony Guy Walker | 1975 - 1986 | USA | 6+ |
| Anthony John Allen | 1975 | United Kingdom | 3 |
| Anthony John Hardy | 2000 - 2002 | United Kingdom | 3+ |
| Anthony Joseph Garcia | 2008 - 2013 | USA | 4 |
| Anthony Joyner | 1983 | USA | 6+ |
| Anthony Kirkland | 1987 - 2009 | USA | 5 |
| Anthony LaRette | 1976 - 1980 | USA | 16 - 31 |
| Anthony Ler Wee Teang | 2001 | Singapore | 1 |
| Anthony Michael Senter | 1973 - 1986 | USA | 10 |
| Anthony Ray Amati | 1996 | USA | 3 |
| Anthony Ray Briley | 1979 | USA | 12+ |
| Anthony Rene Wimberly | 1984 - 1985 | USA | 3 |
| Anthony Sowell | 2007 - 2009 | USA | 11+ |
| Anthony Sully | 1983 | USA | 6 |
| Antoine François Desrues | 1773 - 1777 | France | 2 |
| Antoinette Renee Frank | 1995 | USA | 3+ |
| Antoinette Scieri | 1924 - 1926 | France | 6 |
| Antonie Ronnie Dixon | 2003 | New Zealand | 1 |
| Antonio Boggia | 1849 - 1859 | Italy | 4 |
| Antonio G. James | 1973 - 1979 | USA | 2 |
| Antonio Izquierdo | 1990 | Spain | 9 |
| António Luís Costa | 2005 - 2006 | Portugal | 3 |
| Antonio Nardello | 1884 - 1885 | USA | 3 |
| Antonio Rodriguez | 2010 | USA | 3 |
| Antonio Russo | 2003 | USA | 1 |
| Antonis Daglis | 1992 - 1995 | Greece | 3 |
| Antony Baekeland | 1972 | USA | 1 |
| Antron Singleton | 2002 | USA | 1 |
| Antuan Bronshtein | 1991 | USA | 2 |
| Anu Singh | 1997 | India | 1 |
| Anxiang Du | 2011 | China | 4 |
| Archibald Thomson Hall | 1977 - 1978 | United Kingdom | 5 |
| Armand Sanguigni | 1969 - 1984 | Canada | 1 |
| Arnfinn Nesset | 1981 - 1983 | Norway | 22+ |
| Arnold Karl Sodeman | 1930 - 1935 | Australia | 4 |
| Arohn Kee | 1991 - 1998 | USA | 3+ |
| Arsen Salavatovich Bayrambekov | 2003 - 2014 | Russia | 6 |
| Arthur Brown Jr. | 1992 | USA | 4 |
| Arthur Frederick Goode III | 1975 - 1976 | USA | 2 |
| Arthur Gary Bishop | 1979 - 1983 | USA | 5 |
| Arthur Hosein | 1969 - 1970 | Trinidad and Tobago | 1 |
| Arthur Hutchinson | 1983 | England | 3 |
| Arthur Lee Burton | 1997 | USA | 1 |
| Arthur Lucas | 1961 | Canada | 2 |
| Arthur Phillip Freeman | 2009 | Australia | 1 |
| Arthur Shawcross | 1972 - 1989 | USA | 14 |
| Artur Narcissov | 2014 - 2015 | Russia | 1+ |
| Artur Ryno | 2006 - 2007 | Russia | 19+ |
| Artyom Alexandrovich Anoufriev | 2010 - 2011 | Russia | 6+ |
| Asande Baninzi | 2001 | South Africa | 18 |
| Ashley Christine Humphrey | 2003 | USA | 1 |
| Ashley Mervyn Coulston | 1992 | Australia | 3 |
| Ashley Paige Benton | 2006 | USA | 1 |
| Assia Esther Wevill | 1969 | Germany | 2 |
| Atalay Filiz | 2012 - 2016 | Turkey | 3+ |
| Attina Marie Cannaday | 1982 | USA | 1 |
| Audrey Marie Hilley | 1975 | USA | 1 |
| Augusta Fairfield Fullam | 1912 | United Kingdom | 1 |
| Augustine Chacon | 1890 - 1902 | Mexico | 1+ |
| Austin Gregory Myers | 2014 | USA | 1 |
| Awilda Lopez | 1994 - 1995 | USA | 1 |
