| Pedro Antonio Díaz | |
| Order: | Acting President of Panama |
| Term Start: | 1 October 1918 |
| Term End: | 12 October 1918 |
| Predecessor: | Ciro Luis Urriola |
| Successor: | Belisario Porras |
| Birth Name: | Pedro Antonio del Carmen Díaz de Obaldía |
Pedro Antonio del Carmen Díaz de Obaldía (5 July 1852 - 8 May 1919) was one of the presidential designates of Panama in 1918 and in that capacity also acting President of Panama from 1 October 1918 to 12 October 1918.
He was elected as the third presidential designate by the National Assembly for the term 1916-1918 and as the second presidential designate for the term 1918-1920.[1] He died before completing his term.