| K. P. Jayanandan | 2003 - 2006 | India | 7 |
| Kaboni Savage | 1998 - 2004 | USA | 12 |
| Kamel Bourgass | 2001 - 2003 | Algeria | 1 |
| Kampatimar Shankariya | 1977 - 1978 | India | 70 |
| Kanae Kijima | 2007 - 2009 | Japan | 3+ |
| Kang Dong-un | 1993 - 1994 | South Korea | 5 |
| Kang Ho-sun | 2005 - 2008 | South Korea | 10 |
| Kang Moon-sub | 1993 - 1994 | South Korea | 5 |
| Kaoru Kobayashi | 2004 | Japan | 2 |
| Karel Charva | 1983 | Czechoslovakia | 5 |
| Karel Šťovíček | 1998 - 2020 | Czech Republic | 3 |
| Karen Frank-McCarron | 2006 | USA | 1 |
| Karl Bluestone | 2001 | United Kingdom | 3 |
| Karl Denke | 1903 - 1924 | Germany | 30+ |
| Karl Francis Werner | 1969 - 1971 | USA | 3 |
| Karl Gustav Hultén | 1944 | Sweden | 1 |
| Karl Helge Hampus Hellekant | 1999 | Sweden | 1 |
| Karl-Heinz LaGrand | 1982 | USA | 1 |
| Karla Faye Tucker | 1983 | USA | 2 |
| Karla Leanne Homolka | 1990 - 1992 | Canada | 2+ |
| Karol Kot | 1964 - 1966 | Poland | 2 |
| Kaspars Petrovs | 2000 - 2003 | Latvia | 13 |
| Katariina Meri-Tuulia Pantila | 2007 | Finland | 1 |
| Katarzyna Onyszkiewiczowa | 1869 - 1870 | Galicia | 3+ |
| Kate Bender Sr. | 1871 - 1873 | USA | 11+ |
| Kate Webster | 1879 | Ireland | 1 |
| Kateřina Bechyňová z Lažan | 1530 - 1533 | Czech Republic | 14 - 30 |
| Katherine Mary Knight | 2000 | Australia | 1 |
| Kathleen Dorsett | 2010 | USA | 1 |
| Kathy Boudin | 1981 | USA | 3 |
| Kazuaki Okazaki | 1988 - 1989 | Japan | 4 |
| KD Kempamma | 1999 - 2007 | India | 6+ |
| Keith Daniel Williams | 1978 | USA | 3 |
| Keith Edmund Gavin | 1982 - 1998 | USA | 2 |
| Keith Eugene Wells | 1990 | USA | 2 |
| Keith George Faure | 1974 - 2004 | Australia | 4 |
| Keith Gibson | 2021 | USA | 6 |
| Keith Hunter Jesperson | 1990 - 1995 | USA | 8+ |
| Keith LaMar | 1989 - 1993 | USA | 6 |
| Keith William Zettlemoyer | 1980 | USA | 1 |
| Keli Lane | 1996 | Australia | 1 |
| Kelly Ann Ryan | 2005 | USA | 1 |
| Kelly Marie Ellard | 1997 | Canada | 1 |
| Kelly Renée Gissendaner | 1997 | USA | 1 |
| Kelsey Patterson | 1954 - 1992 | USA | 2 |
| Kelvin Shelby Malone | 1981 | USA | 4+ |
| Kendall Francois | 1996 - 1998 | USA | 8+ |
| Kenichi Hirose | 1989 - 1995 | Japan | 13 |
| Kenneth Alessio Bianchi | 1977 - 1979 | USA | 12+ |
| Kenneth Biros | 1991 | USA | 1 |
| Kenneth Bishop | 1985 - 1997 | Canada | 3 |
| Kenneth Erskine | 1986 | United Kingdom | 7+ |
| Kenneth Eugene Foster Jr. | 1996 | USA | 1 |
| Kenneth Eugene Smith | 1988 | USA | 1 |
| Kenneth Francis Harrison | 1967 - 1969 | USA | 4 |
| Kenneth Granviel | 1974 - 1975 | USA | 7+ |
| Kenneth James Noye | 1996 | United Kingdom | 1 |
| Kenneth Junior French | 1993 | USA | 4 |
| Kenneth Leith Halliwell | 1967 | United Kingdom | 1 |
| Kenneth McDuff | 1966 - 1992 | USA | 14+ |
| Kenneth Regan | 2003 | United Kingdom | 5 |
| Kent Bowers | 1984 | Belize | 1 |
| Kenyel Brown | 2019 - 2020 | USA | 6 |
| Kermit Gosnell | 2006 - 2010 | USA | 48+ |
| Kerry Lyn Dalton | 1988 | USA | 1 |
| Kevan Brumfield | 1993 | USA | 1 |
| Kevin Bernard Haley | 1984 | USA | 2+ |
| Kevin Cooper | 1983 | USA | 2 |
| Kevin Donald Foster | 1996 | USA | 1+ |
| Kevin Garry Crump | 1973 | Australia | 2 |
| Kevin Johnson Jr. | 2005 | USA | 1 |
| Kevin Ray Underwood | 2006 | USA | 1 |
| Kevin Taylor | 2001 | USA | 4 |
| Khalil Wheeler-Weaver | 2016 | USA | 4 |
| Kiana Barker | 2010 | USA | 1 |
| Kim Dae-doo | 1975 | South Korea | 18 |
| Kim Dae-han | 2003 | South Korea | 192 |
| Kim De Gelder | 2009 | Belgium | 4 |
| Kim Gi-hwan | 1993 - 1994 | South Korea | 5 |
| Kim Hyun-yang | 1993 - 1994 | South Korea | 5 |
| Kimberly Anderson | 2001 | USA | 1 |
| Kimberly Clark Saenz | 2008 | USA | 10 |
| Kimberly Diane Cargill | 2010 | USA | 1 |
| Kimberly LaGayle McCarthy | 1997 | USA | 2 |
| Kimveer Gill | 2006 | Canada | 1 |
| Kiyoshi Ōkubo | 1971 | Japan | 8 |
| Kiyotaka Katsuta | 1972 - 1982 | Japan | 8+ |
| Klaas Annink | 1770 - 1774 | Netherlands | 1 |
| Klaus Gosmann | 1960 - 1963 | Germany | 7 |
| Krishna Nanan Maharaj | 1986 | United Kingdom | 2 |
| Kristen Avery Pittman | 2001 | USA | 2 |
| Kristen Heather Gilbert | 1990 - 1996 | USA | 4+ |
| Kristin Margrethe Rossum | 2000 | USA | 1 |
| Kristina Joy Fetters | 1994 | USA | 1 |
| Krystian Bala | 2000 | Poland | 1 |
| Kwon Jae-chan | 2003 - 2021 | South Korea | 3 |
| Kyle Aaron Huff | 2006 | USA | 6 |
| Kyriakos Papachronis | 1981 - 1982 | Greece | 3 |
