Kariyawasam is a surname. Notable people with the surname include:
Akila Viraj Kariyawasam (born 1973), Sri Lankan politician Albert Kariyawasam (born 1921), Sri Lankan politician Gayathri Kariyawasam (born 1976), Sri Lankan cricketer Nimesh Kariyawasam (born 1994), Sri Lankan cricketer Nipuna Kariyawasam (born 1991), Sri Lankan cricketer Pradeep Kariyawasam (), Sri Lankan businessman Prasad Kariyawasam (born 1954), Sri Lankan diplomat Sagara Kariyawasam (born 1967), Sri Lankan lawyer and politician Sarala Kariyawasam (born 1996), Sri Lankan actress