Nicolas Alfonsi (13 April 1936 – 16 March 2020) was a French politician, member of the Senate of France, representing the department of Corse-du-Sud.
He was a member of the Radical Party of the Left, and was by profession a lawyer.
In this capacity, he served as Vice-President of the Senate's Committee on Laws from 2008 to 2014.
He also served as interim President of the Assembly of Corsica in 1998, following health issues faced by Jean-Paul de Rocca Serra.
He did not run for re-election in the 2014 senatorial elections in September.