Tennakoon, Tennekoon, Thennakoon, or Tennakorn () is a surname found in Sri Lanka. Notable people with this name include:
Tennakoon Deshabandu Tennakoon (born 1971), a Sri Lankan police officer Janaka Bandara Tennakoon, a Sri Lankan politician Mudiyanse Tennakoon (1934 – 1991), a Sri Lankan politician Nilmini Tennakoon (born 1965), a Sri Lankan actress P. M. K. Tennakoon (born 1917), a Sri Lankan politician Piyasena Tennakoon (1917 – 1982), a Sri Lankan lawyer and politician Pramitha Tennakoon (born 1978), a Sri Lankan politician Raipiyel Tennakoon (1899 – 1965), a Sri Lankan poet Sampath Tennakoon (1959 – 2021), a Sri Lankan actor Soma Kumari Tennakoon (1960 – 2009), a Sri Lankan politician Upali Tennakoon, a Sri Lankan journalist
Tennekoon
Anura Tennekoon (born 1946), a Sri Lankan cricketer Herbert Tennekoon, a Sri Lankan civil servant Panini Tennekoon, a Sri Lankan architect R. B. Tennekoon, a Sri Lankan politician R. S. Tennekoon, a Sri Lankan politician Reginald Tennekoon (born 1912), a Sri Lankan politician and businessman T. B. Tennekoon, a Sri Lankan politician Victor Tennekoon (1914 – 1990), a Sri Lankan lawyer and jurist William Tennekoon, a Sri Lankan banker Surangani Tennekoon, 9th Governor of Central Province
Thennakoon
Daya Thennakoon (1941 – 2020), a Sri Lankan actor Kavindya Thennakoon (born 1995), a Sri Lankan activist Keerthi Thennakoon, a Sri Lankan governor