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

Nikolay Kamarin (1856–1931) – first guild merchant, public figure. Continued the Kamarin family business. >>

Pavel Kamarin (1815 [?]–1889) – first guild merchant, philanthropist. Co-owner of the Kamarin Brothers firm. >>

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

Vasily Karyakin (1851-1913) – a merchant. >>

Vasily Kudryachev (1869-1941) – entrepreneur and Head of Riga Grebenshchikov Old Believers Community. >>

Matvey Kuznetsov (1846-1911) – manufacturer, owner of the "Partnership for the production of porcelain, earthenware and majolica products". >>

Nikolay Kuznetsov (1869-1938) – a manufacturer. >>