Philadelphus is the scientific name of mock-oranges, a genus of shrubs.
Philadelphus is the Latinized form of the ancient Greek Philadelphos (Φιλάδελφος, meaning "brother-loving" or "sibling-loving"), it may also refer to:
People:
- Antiochus XI Ephiphanes Philadelphus (d. 92 BC), king of the Seleucid Empire 95-92 BC
- Attalus II Philadelphus (220–138 BC), king of Pergamon 160- 138 BC
- Iotape Philadelphus (before 17- c. 52 AD), princess and later queen of Commagene
- Laodice VII Thea Philadelphus (after 122- after 86 BC), princess of the Seleucid Empire and later queen of Commagene
- Mithridates IV Philopator Philadelphus (before 179- c.150 BC), king of Pontus c.155 –c.150 BC
- Philip I Philadelphus, king of the Seleucid Empire 95 BC-84/83 BC
- Ptolemy Philadelphus (son of Cleopatra) (36-29 BC), prince of Ptolemaic Egypt 36 BC-30 BC, son of Mark Antony
- Ptolemy II Philadelphus (309–246 BC), king of Ptolemaic Egypt 283 BC-246 BC
- Arsinoe II, given the epithet "Philadelphoi" (plural form) after marrying her brother Ptolemy II Philadelphus
- Ptolemy XII Auletes (Philopator Philadelphos), Ptolemaic king
- Philadelphus of Byzantium, bishop of Byzantium 211-217 AD
- Deiotarus Philadelphus (died c.6 AD), last king of Paphlagonia before 31 BC-c.6AD
- Philadelphos/Philadelphus, Christian martyrs commemorated in the Eastern Orthodox liturgical calendar on February 8, May 10 and September 2
- Philadelphus Philadelphia, stage name of Jacob Philadelphia
Other uses: