| Order1: | Member of parliament, Lok Sabha for Mayiladuthurai |
| Term Start1: | 1998 |
| Term End1: | 1999 |
| Primeminister1: | Atal Bihari Vajpayee |
| Predecessor1: | P. V. Rajendran |
| Successor1: | Mani Shankar Aiyar |
| Birth Date: | 1 July 1944 |
| Birth Place: | Kumbakonam, India |
| Death Place: | Kumbakonam |
| Nationality: | Indian |
| Party: | TMC |
| Children: | 2 |
| Grandchildrens: | 3 |
Krishnasamy Krishnamoorthy (1 July 1944 – 16 January 2019) was an Indian politician. He served as a Member of Lok Sabha from Mayiladuthurai from 1998 to 1999.[1]
He was born on 1 July 1944 to Krishnasamy at Kumbakonam in India. He graduated in arts from Government College, Kumbakonam and qualified as a lawyer from Madras Law College.
Krishnamoorthi served as a Member of the Tamil Nadu Legislative Assembly from 1984 to 1988. In 1998, he stood for election from Mayiladuthurai constituency for 12th Lok Sabha as a candidate of Tamil Maanila Congress and won over Pattali Makkal Katchi candidate by margin of 42,456 votes in which the election Mani Shankar Aiyar finished fourth and lost his deposit.