Rienk is a Dutch masculine given name.
Notable people with the name include:
Rienk Jelgerhuis (1729–1806), a Dutch artist
Rienk Kuiper (1886–1966), a Dutch-American theologian and college administrator
Rienk Feenstra (1920–2005), a Dutch philatelist
Rienk Mast (born 2001), a Dutch basketball player
