Kirthi Nissanka Seneviratne (22 November 1929 - 10 August 1986) was a Sri Lankan academic and physician.
He was a Professor of Physiology and founding director of Sri Lanka's Postgraduate Institute of Medicine.Educated at the Royal College, Colombo where he won the Arunachchalam Prize and graduated with a MBBS with honours in 1954 from the University of Ceylon, Colombo and went on to gain his PhD from the University of Edinburgh.
His brother, Nihal, was a former Secretary General of Parliament.
Joining the academic staff of the University of Ceylon's Medical Faculty in 1957 as a demonstrator, he went on the became a Professor of Physiology.
In 1974 he establish the Institute of Postgraduate Medicine, which later became the Postgraduate Institute of Medicine.
He was also a reservist Captain in the Sri Lanka Army.