| José Joaquín Martínez Sieso | |
| Order: | 6th |
| Office: | President of Cantabria |
| Term Start: | 13 July 1995 |
| Term End: | 27 June 2003 |
| Deputy: | Miguel Ángel Revilla |
| Predecessor: | Juan Hormaechea |
| Successor: | Miguel Ángel Revilla |
| Birth Name: | José Joaquín Martínez Sieso |
| Birth Date: | 13 April 1956 |
| Birth Place: | Bilbao, Biscay, Spanish State |
| Party: | PP |
José Joaquín Martínez Sieso (born 13 April 1956) is a Spanish politician and former President of Cantabria between 1995 and 2003.[1]