| Honorific-Prefix: | Hon. |
| K. Pathmanathan | |
| Honorific-Suffix: | MP |
| Constituency Mp: | Ampara District |
| Parliament: | Sri Lankan |
| Successor: | T.T. William, TNA |
| Term Start: | 2004 |
| Term End: | 2009 |
| Birth Date: | 1948 5, df=yes |
| Death Place: | Madurai, Tamil Nadu, India |
| Party: | Tamil National Alliance |
| Occupation: | District Manager, National Housing Development Authority |
Kanagasabai Pathmanathan was a Sri Lankan Tamil politician and Member of Parliament.
Pathmanathan was one of the Tamil National Alliance's candidates in Ampara District at the 2004 parliamentary election. He was elected and entered Parliament.[1]
Pathmanathan died on 21 May 2009 after a brief illness.[2]