Theodor-Ferdinand Kalep (1866–1913) – inventor, businessman, production organizer, worked at Riga enterprises «Lange and son», «Motor» and «Russo-Balt». >>

Alexander Kalery (1956) – Soviet and Russian cosmonaut. Born in Latvia  (Jūrmala) in 1956. >>

Nikolay Kalinin (1910-2004) – professor, the 1-st rector of Riga Institute of Civil Aviation Engineering (1960-1965). >>

Melety Kallistratov (1896–1941) – public and political leader. Deputy of the 1-4 Saiema. >>

Viktor Kalnberz (1928–2021) – an outstanding physician, orthopedic surgeon, academician, director of the Latvian Research Institute of Traumatology and Orthopedics (1959-1994). Hero of Socialist Labor (1988), holder of the Order of the Three Stars of the Republic of Latvia (2000). >>

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Boris Kamenetsky (1935) – geophysicist, stayed in polar stations at Shpitsbergen and Chukotka, participant of the 5th and 8th Antarctic expeditions. >>

Yefim Kamkin (1821–1910) – a merchant of the 1st Guild. Gained renown by his donations to  churches. >>