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- Sandra Kalniete (1952) – politician, diplomat, former Latvia's EU commissioner
- Bruno Kalniņš (1899–1990) – Saeima member, Red Army General
- Imants Kalniņš (1941) – composer, politician
- Oskars Kalpaks (1882–1919) – colonel, first Commander of Latvian National Armed Forces
- Kaspars Kambala (1978) – basketball player
- Mārtiņš Karsums (1986) – ice hockey player
- Renārs Kaupers (1974) – musician
- Jēkabs Ketlers (1610–1682) – Duke of the Duchy of Courland and Semigallia
- Gustavs Klucis (1895–1938) – painter and graphic designer
- Aleksandrs Koblencs (1916–1993) – chess player
- Ābrams Izāks Kūks (1864–1935) – chief rabbi, Jewish thinker, statesman, diplomat, mediator and a renowned scholar
- Aleksandrs Kovaļevskis (1840–1901) – zoologist
- Gidon Kremer (1947) – violinist and conductor
- Miķelis Krogzems (1850–1879) – poet, author and translator of German poets
- Juris Kronbergs (1946) – poet, writer, free-lance journalist, translator
- Atis Kronvalds (1837–1875) – teacher and journalist, reformed the Latvian language, organized the first Latvian Song and Dance Festival
- Dainis Kūla (1959) – athlete (Olympic gold medal in javelin)
- Alberts Kviesis (1881–1944) – president
Read more about this topic: List Of Latvians