| Office1: | Senator |
| Term Start1: | 27 April 1938 |
| Term End1: | 7 September 1938 |
| Constituency1: | Agricultural Panel |
| Birth Date: | 8 March 1890 |
| Birth Place: | County Kildare, Ireland |
| Death Place: | Dublin, Ireland |
| Children: | 7 |
| Alma Mater: | Albert Agricultural College |
John Nassau Greene (8 March 1890 – 11 February 1973) was an Irish politician. A farmer from Athy,[1] he was elected to Kildare County Council in the 1925 local elections, standing for the Farmers' Party in the Athy local electoral area.[2]
He was an independent member of Seanad Éireann from April to August 1938. He was elected to the 2nd Seanad in April 1938 to the Agricultural Panel.[3] He did not contest the August 1938 Seanad election.[3]