Krishnasami Thulasiah Vandayar (11 May 1929 – 17 May 2021) was an Indian politician and head of the Poondi estate in the Thanjavur district of Tamil Nadu, India.
He was the chairman of the Managing Committee of the AVVM Pushpam College.
[citation needed] Vandayar was a member of the Indian National Congress from an early age.
In the 1991 Lok Sabha elections, he was elected from the Thanjavur Lok Sabha constituency defeating S. S. Palanimanickam of the Dravida Munnetra Kazhagam party.
Vandayar served as the president of the Thanjavur District Congress Committee.