Rao Bahadur Pattar Shangumani Narayana Iyer (born October 1898) was an Indian lawyer, civil servant and administrator who served as the Diwan of Cochin kingdom from 1925 to 1930.
Narayana Iyer matriculated from the CMS High School, Trichur.
While serving as Chief Justice of Cochin, he was appointed Diwan of the princely state.
As Diwan, Narayana Iyer presided over the first session of the Cochin Legislative Council.
He was also responsible for the construction of water pipelines to Trichur, Mattancheri, Nemmara and Ayalore.