Philadelphus (disambiguation)
- Antiochus XI Ephiphanes Philadelphus
- Arsinoe II
- Attalus II Philadelphus
- Byzantium
- Eupator (disambiguation)
- February 8 (Eastern Orthodox liturgics)
- Iotape Philadelphus
- Jacob Philadelphia
- Jeyes Fluid
- Laodice VII Thea Philadelphus
- May 10 (Eastern Orthodox liturgics)
- Mithridates IV Philopator Philadelphus
- Paphlagonia
- Philadelphia (disambiguation)
- Philadelphus
- Philadelphus of Byzantium
- Philadelphus, North Carolina
- Philip I Philadelphus
- Philometor (disambiguation)
- Philopator (disambiguation)
- Phyladelphus
- Ptolemy II Philadelphus
- Ptolemy Philadelphus (son of Cleopatra)
- Ptolemy XII Auletes
- Robeson County, North Carolina
- September 2 (Eastern Orthodox liturgics)