Achieng is both a given name and a surname. Notable people with the name include:
Conjestina Achieng (born 1977), Kenyan boxer Sarah Opendi Achieng (born 1968), Ugandan politician Achieng Abura (died 2016), Kenyan musician Achieng Ajulu-Bushell (born 1994), British swimmer Achieng Oneko (1920–2007), Kenyan freedom fighter and politician