| Caleb Fairley | 1995 | USA | 2 |
| Callisto Grandi | 1873 - 1875 | Italy | 4 |
| Calvin Jackson | 1973 - 1974 | USA | 9 |
| Camille Joseph Cléroux | 1990 - 2010 | Canada | 3 |
| Camillo Carmine Galante | 1925 - 1979 | USA | 80+ |
| Campo Elías Delgado Morales | 1986 | Colombia | 29 |
| Carel Johannes Delport | 1992 | South Africa | 9 |
| Carey Dale Grayson | 1994 | USA | 1 |
| Caril Ann Fugate | 1958 | USA | 11 |
| Carl Anthony Williams | 2003 - 2004 | Australia | 4 |
| Carl Austin Hall | 1953 | USA | 1 |
| Carl Austin Weiss Sr. | 1935 | USA | 1 |
| Carl Drega | 1997 | USA | 4 |
| Carl Eric Brandt | 1971 - 2004 | USA | 4+ |
| Carl Eugene Watts | 1974 - 1982 | USA | 15+ |
| Carl Friedrich Wilhelm Großmann | 1918 - 1921 | Germany | 26+ |
| Carl Girouard | 2020 | Canada | 2 |
| Carl H. Drew | 1979 - 1980 | USA | 1 |
| Carl Hau | 1906 | Germany | 1 |
| Carl Junior Isaacs | 1973 | USA | 7 |
| Carl Manning | 1999 - 2000 | United Kingdom | 1 |
| Carl Menarik | 1914 - 1915 | USA | 8 |
| Carl Panzram | 1899 - 1929 | USA | 21 |
| Carl Robert Brown | 1982 | USA | 8 |
| Carl Wayne Buntion | 1990 | USA | 1 |
| Carla Ann Hughes | 2006 | USA | 2 |
| Carlos Alberto Topp Collins | 1980 - 1981 | Chile | 10 |
| Carlos DeLuna | 1983 | USA | 1 |
| Carlos Eduardo Robledo Puch | 1971 - 1972 | Argentina | 11 |
| Carlos Hernández | 1979 - 1996 | USA | 1 |
| Carlos Monzón | 1988 | Argentina | 1 |
| Carlton Eric Dotson Jr. | 2003 | USA | 1 |
| Carlton Michael Gary | 1978 | USA | 8+ |
| Carlyle Harris | 1890 - 1891 | USA | 1 |
| Carman L. Deck | 1996 | USA | 2 |
| Carmello DeJesus | 1971 - 1973 | Puerto Rico | 4 |
| Carol Mary Bundy | 1980 | USA | 2+ |
| Carol Scott Carr | 2002 | USA | 2 |
| Caroline Grills | 1947 - 1953 | Australia | 4 |
| Carolyn Riley | 2006 | USA | 1 |
| Carolyn Warmus | 1989 | USA | 1 |
| Carroll Cole | 1947 - 1980 | USA | 15+ |
| Cary Anthony Stayner | 1999 | USA | 4 |
| Catalina de los Ríos y Lísperguer | 1622 - 1662 | Chile | 40 |
| Catarina Palse | 1863 - 1864 | Brazil | 3-6 |
| Caterina Fort | 1946 | Italy | 4 |
| Catherine Flannagan | 1880 - 1883 | United Kingdom | 1+ |
| Catherine Hayes | 1726 | United Kingdom | 1 |
| Catherine Mandeville Snow | 1833 | Canada | 1 |
| Catherine May Wood | 1987 | USA | 5 |
| Catherine Monvoisin | 1660 - 1679 | France | Exact number unknown; suspected involvement in numerous deaths |
| Catherine Wilson | 1854 - 1862 | United Kingdom | 1 |
| Cathy Lynn Sarinana | 2005 | USA | 2 |
| Cayetano Domingo Grossi | 1896 - 1898 | Argentina | 5 |
| Cayetano Santos Godino | 1906 - 1912 | Argentina | 4+ |
| Cecil Henry Floyd | 1973 - 1974 | USA | 6+ |
| Cecile Bombeek | 1976 - 1977 | Belgium | 3 |
| Cécile Brossard | 2005 | France | 1 |
| Celeste Beard Johnson | 1999 | USA | 1 |
| Celestina Sommer | 1856 | United Kingdom | 1 |
| Céline Lesage | 2000 - 2007 | France | 6 |
| Cesar Armando Laurean | 2007 | USA | 1 |
| Cesar Barone | 1991 - 1993 | USA | 4+ |
| Cesar Roberto Fierro | 1979 | USA | 1 |
| Cesar Rodriguez | 2006 | USA | 1 |
| Chad Guy Daybell | 2019 | USA | 4 |
| Chandrakant Jha | 1998 - 2007 | India | 6 |
| Chante Jawan Mallard | 2001 | USA | 1 |
| Charity Lamb | 1854 | USA | 1 |
| Charlene Adell Gallego | 1978 - 1980 | USA | 11+ |
| Charles Albanese | 1980 - 1981 | USA | 3 |
| Charles Albright | 1988 - 1991 | USA | 1 |
| Charles Anthony Boyd | 1986 - 1987 | USA | 3 |
| Charles Arthur Floyd | 1925 - 1934 | USA | 10 |
| Charles Bannon | 1930 | USA | 6 |
| Charles Becker | 1912 | USA | 1 |
| Charles Brooks Jr. | 1976 | USA | 1 |
| Charles Carneglia | 1976 - 2008 | USA | 4 |
| Charles Chapin | 1918 | USA | 1 |
| Charles Cullen | 1988 - 2003 | USA | 29+ |
| Charles Davis Lawson | 1929 | USA | 7 |
| Charles Edwin Kelley | 1961 | USA | 3 |
| Charles Elroy Laplace | 2004 | USA | 1 |
| Charles Jackson Jr. | 1975 - 1982 | USA | 8+ |
| Charles Jason Graves | 1995 | USA | 3 |
| Charles Joseph Whitman | 1966 | USA | 17 |
| Charles Julius Guiteau | 1881 | USA | 1 |
| Charles Kwabena Ebo Quansah | 1993 - 2000 | Ghana | 9 |
| Charles Lee Duffy | 1997 | USA | 3 |
| Charles Louman Meach III | 1973 - 1982 | USA | 5 |
| Charles Manson | 1969 | USA | 9+ |
| Charles Michael Hedlund | 1991 | USA | 2 |
| Charles Monroe Butler Jr. | 1999 | USA | 1 |
| Charles Ng | 1983 - 1985 | USA | 11 |
| Charles Nicoletti | 1950 - 1977 | USA | 20 |
| Charles Noel Brown | 1961 | USA | 3 |
| Charles Peace | 1854 - 1878 | United Kingdom | 2 |
| Charles Ray Hatcher | 1969 - 1982 | USA | 5 |
| Charles Raymond Starkweather | 1957 - 1958 | USA | 11 |
| Charles Rodman Campbell | 1975 - 1982 | USA | 4+ |
| Charles Schmid | 1964 - 1965 | USA | 4 |
| Charles Sobhraj | 1963 - 1976 | Thailand | 12+ |
| Charles Stanard Severance | 2003 - 2014 | USA | 3 |
| Charles Stevens | 1989 | USA | 4 |
| Charles Thomas Walker | 1983 | | 2 |
| Charles Troy Coleman | 1975 - 1979 | USA | 3 |
| Charles Victor Thompson | 1998 | USA | 2 |
| Charles Voyde Harrelson | 1968 - 1979 | USA | 2+ |
| Charles William Davis Jr. | 1975 - 1977 | USA | 3+ |
| Charlotte Corday | 1793 | France | 1 |
| Charlotte Mulhall | 2005 | Ireland | 1 |
| Chelsea Lea Richardson | 2003 | USA | 2 |
| Chen Chin-hsing | 1997 | Taiwan | 5 |
| Chen Fuzhao | 2003 | China | 17 |
| Chen Jui-chin | 1985 - 2003 | Taiwan | 6+ |
| Cheng Chieh | 2014 | Taiwan | 4 |
| Cherie Lash Rhoades | 2014 | USA | 4 |
| Cheryl Christina Crane | 1958 | USA | 1 |
| Chester Ellsworth Gillette | 1906 | USA | 1 |
| Chester Turner | 1987 - 1998 | USA | 15+ |
| China Arnold | 2005 | USA | 1 |
| Chisako Kakehi | 2007 - 2013 | Japan | 3+ |
| Cho Seung-hui | 2007 | South Korea | 32 |
| Christa Gail Pike | 1995 | USA | 1 |
| Christian Charles Nielsen | 2006 | USA | 4 |
| Christian Devi Brando | 1990 | USA | 1 |
| Christian Dornier | 1989 | France | 14 |
| Christiana Edmunds | 1870 - 1871 | United Kingdom | 1+ |
| Christie Michelle Scott | 2008 | USA | 1 |
| Christina Aistrup Hansen | 2012 - 2015 | Denmark | 4 |
| Christina Elaine Boyer | 1992 - 1994 | USA | 1 |
| Christina Johansdotter | 1740 | Sweden | 1 |
| Christina Marie Riggs | 1997 | USA | 2 |
| Christine Adewunmi | 2012 | USA | 3 |
| Christine Laverne Falling | 1980 - 1982 | USA | 6 |
| Christine Malèvre | 1997 - 1998 | France | 6+ |
| Christine Marie Paolilla | 2003 | USA | 4 |
| Christine Papin | 1933 | France | 2 |
| Christine Schürrer | 2008 | Germany | 2 |
| Christman Genipperteinga | 1569 - 1581 | Germany | 964 |
| Christopher Andre Vialva | 1999 | USA | 2 |
| Christopher Black Sr. | 1998 | USA | 3 |
| Christopher Collings | 2007 | USA | 1 |
| Christopher Dale Flannery | 1970 - 1985 | Australia | 12 |
| Christopher Daniel Duntsch | 2013 - 2015 | USA | 2+ |
| Christopher Douglas Roney | 1987 - 1996 | USA | 1 |
| Christopher Dwayne Peterson | 1990 | USA | 4+ |
| Christopher Halliwell | 2003 - 2011 | United Kingdom | 2 |
| Christopher J. Newton | 2001 | USA | 1 |
| Christopher Jordan Dorner | 2013 | USA | 4 |
| Christopher Lunz | 2003 | USA | 20 |
| Christopher Mhlengwa Zikode | 1994 - 1995 | South Africa | 18 |
| Christopher Porco | 2004 | USA | 1 |
| Christopher Sepulvado | 1992 | USA | 1 |
| Christopher Wayne Hudson | 2007 | Australia | 1 |
| Christopher Wilder | 1984 | USA | 8 |
| Cimarron Bernard Bell | 2003 - 2004 | USA | 4 |
| Clara Harris | 2002 | USA | 1 |
| Clara Jane Schwartz | 2001 | USA | 1 |
| Clarence Bagwell | 1941 | USA | 1 |
| Clarence Edward Hill | 1982 | USA | 1 |
| Clarence Hill | 1938 - 1942 | USA | 6 |
| Clarence Ray Allen | 1974 - 1980 | USA | 3 |
| Clarence V. Bertucci | 1945 | USA | 9 |
| Clarence Wayne Dixon | 1978 | USA | 1 |
| Claude Frizzell Bloodgood III | 1969 | USA | 1 |
| Claude Lafayette Dallas Jr. | 1981 | USA | 2 |
| Claude Lastennet | 1993 - 1994 | France | 5 |
| Claudine Longet | 1976 | USA | 1 |
| Clay King Smith | 1998 | USA | 5 |
| Clayton Anthony Fountain | 1974 - 1983 | USA | 5 |
| Clayton Robert Weatherston | 2008 | New Zealand | 1 |
| Clementine Barnabet | 1911 - 1912 | United States | 35 |
| Cleo Joel Green III | 1983 | USA | 1 |
| Cleophus Prince Jr. | 1990 | USA | 6 |
| Clifford Olson | 1980 - 1981 | Canada | 11 |
| Clifton Lee Ray Jr. | 1987 - 1994 | USA | 3+ |
| Clover Demarr Boykin | 1993 - 1994 | USA | 2 |
| Cody Alan Legebokoff | 2009 - 2010 | Canada | 4 |
| Colin Campbell Norris | 2002 | England | 4+ |
| Colin Ferguson | 1993 | Jamaica | 6 |
| Colin Howell | 1991 | United Kingdom | 2 |
| Colin Ireland | 1993 | United Kingdom | 5 |
| Colin Richard Forman | 1977 | United Kingdom / Australia | 5 |
| Constance Emily Kent | 1860 | United Kingdom | 1 |
| Constance Margaret Fisher | 1954 - 1966 | USA | 6 |
| Cordelia Adelaide Brown Botkin | 1898 | USA | 2 |
| Cordell Farrington | 2002 - 2003 | Bahamas | 5 |
| Corey Johnson | 1992 | USA | 7 |
| Cornelius Gerhardus van Rooyen | 1988 - 1989 | South Africa | 6+ |
| Cory Deonn Morris | 2002 - 2003 | USA | 5+ |
| Cory Gregory | 2005 | USA | 1 |
| Courtney Christine Schulhoff | 2004 | USA | 1 |
| Courtney Larrell Lockhart | 2008 | USA | 1+ |
| Coy Wayne Wesbrook | 1997 | USA | 5 |
| Craig Chandler Price | 1987 - 1989 | USA | 4 |
| Craig Godineaux | 2000 | USA | 5 |
| Craig Michael Wood | 2014 | USA | 1 |
| Crosley Alexander Green | 1989 | USA | 1 |
| Crystal Gail Mangum | 2011 | USA | 1 |
| Cuhuatemoc Hinricky Peraita | 1994 | USA | 3 |
| Curtis Dean Anderson | 1984 - 2000 | USA | 2 |
| Curtis Don Brown | 1985 - 1986 | USA | 3+ |
| Curtis Michael Allgier | 2007 | USA | 1 |
| Cynthia Coffman | 1986 | USA | 4 |
