Ponnambalam Nagalingam was a Sri Lankan Tamil politician and Member of the Senate.

After qualifying as a lawyer Nagalingam practiced law in Tellippalai, Uduvil and Chunnakam.

[citation needed] Nagalingam became involved in politics as a student, joining the Tamil Youth Congress.

At the March 1960 parliamentary election Nagalingam stood as the LSSP's candidate in Uduvil but was defeated by Visvanathan Dharmalingam.

[2] He also contested the July 1960 and March 1965 parliamentary elections but each time was defeated by Dharmalingam.