Njiru is the surname of the following people and places:
People Patrick Njiru (born 1957), a former Kenyan rally driver Wawira Njiru, a Kenyan entrepreneur, nutritionist, and philanthropist Jane Wanjuki Njiru, a Kenyan politician Silas Silvius Njiru (1928–2020), a Kenyan Roman Catholic bishop Paul Kariuki Njiru (born 1963), a Kenyan Roman Catholic bishop James Njiru (died 2013), a Kenyan politician Kennedy Njiru (1987–2020), Kenyan steeplechase runner
Places Njiru, Nairobi, a neighbourhood in Nairobi